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web1b
join:2008-10-25
USA

web1b

Member

[Connectivity] Repeated disconnects

Every weekend I notice Internet access drops until I unplug and reconnect the modem.
Today, Internet access started dropping again as it has for the last few weeks. I reset the modem and it would work for 5 minutes or so and then drop again. I would reset the modem and it would work for another few minutes.
I called Comcast and had their automated system reset my modem remotely and now it has stayed connected for the last 20 minutes.
Hopefully it is fixed for the long term now.

I don't know what's different about them resetting the modem vs me power cycling myself or if it is just a coincidence that the connection is staying up longer now.

What are common causes for connection issues that are only temporarily fixed by resetting the modem?

Johkal
Cool Cat
MVM
join:2002-11-13
Pennsyltucky

Johkal

MVM

[Connectivity] Re: Repeated disconnects

With the information you have given, please review »Comcast High Speed Internet FAQ »How To Get Help! and answer all pertinent questions.
web1b
join:2008-10-25
USA

web1b

Member

Sacramento CA
Unable to access the Internet several times per day. Temporarily fixed by unplugging and replugging cable modem power.
Seems to be most common evenings and weekends, but can be any time.
Model Name: SB6121
Vendor Name: Motorola
Firmware Name: SB_KOMODO-1.0.6.16-SCM00-NOSH
Boot Version: PSPU-Boot(25CLK) 1.0.12.18m3
Not related to antivirus because it affects all devices on the network including smartphones
Performance plan
Speed test on Xfinity site using Chrome browser 90 down, 6 up

Cable Modem
Status Signal Addresses Configuration Logs Open Source Help
This page displays detailed information intended for use by an authorized Motorola Corporation Cable Modem technician.
Time Priority Code Message
May 13 2016 14:54:58 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=XXXXXXXXXXXXXXXXXXXX;CM-QOS=1.1;CM-VER=3.0;
May 12 2016 21:49:15 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=XXXXXXXXXXXXXXXXXXXX;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:14 6-Notice N/A Cable Modem Reboot due to power reset ;CM-MAC=XXXXXXXXXXX;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
May 12 2016 21:45:09 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=XXXXXXXXXXXXXXXXXXXX;CM-QOS=1.1;CM-VER=3.0;
May 12 2016 18:45:57 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=XXXXXXXXXXXXXXXXXXXX;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:14 6-Notice N/A Cable Modem Reboot due to T4 timeout ;CM-MAC=XXXXXXXXXXX;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
May 12 2016 18:45:11 3-Critical R04.0 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=XXXXXXXXXXXXXXXXXXXX;CM-QOS=1.1;CM-VER=3.0;
May 12 2016 18:41:10 3-Critical R06.0 Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=XXXXXXXXXXXXXXXXXXXX;CM-QOS=1.1;CM-VER=3.0;
May 12 2016 18:41:10 3-Critical R03.0 Ranging Request Retries exhausted;CM-MAC=XXXXXXXXXXXXXXXXXXXX;CM-QOS=1.1;CM-VER=3.0;
May 12 2016 18:41:09 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=XXXXXXXXXXXXXXXXXXXX;CM-QOS=1.1;CM-VER=3.0;
May 12 2016 18:38:13 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=XXXXXXXXXXXXXXXXXXXX;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:01:05 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=XXXXXXXXXXXXXXXXXXXX;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:55 3-Critical R04.0 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=XXXXXXXXXXXXXXXXXXXX;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:14 6-Notice N/A Cable Modem Reboot due to T4 timeout ;CM-MAC=XXXXXXXXXXX;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
May 12 2016 18:36:42 3-Critical R04.0 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=XXXXXXXXXXXXXXXXXXXX;CM-QOS=1.1;CM-VER=3.0;
May 12 2016 18:32:27 3-Critical R06.0 Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=XXXXXXXXXXXXXXXXXXXX;CM-QOS=1.1;CM-VER=3.0;
May 12 2016 18:32:27 3-Critical R03.0 Ranging Request Retries exhausted;CM-MAC=XXXXXXXXXXXXXXXXXXXX;CM-QOS=1.1;CM-VER=3.0;
May 12 2016 18:32:25 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=XXXXXXXXXXXXXXXXXXXX;CM-QOS=1.1;CM-VER=3.0;
May 12 2016 18:25:58 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=XXXXXXXXXXXXXXXXXXXX;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:30:34 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=XXXXXXXXXXXXXXXXXXXX;CM-QOS=1.1;CM-VER=3.0;
Status | Signal | Addresses | Configuration | Logs | Open Source | Help

© Copyright 2012 - 2013 Motorola Mobility, LLC. All rights reserved.
web1b

web1b

Member

I can't tell if this is a problem with the modem that would be resolved by replacing the modem with a new one or if this is a Comcast service issue.

telcodad
MVM
join:2011-09-16
Lincroft, NJ

telcodad

MVM

said by web1b:

I can't tell if this is a problem with the modem that would be resolved by replacing the modem with a new one or if this is a Comcast service issue.

The number of T3 and T4 timeouts in the log would indicate some type of an upstream issue (high power levels, low uSNR, etc.): »Comcast High Speed Internet FAQ »What do messages about timeouts mean?

Can you post the downstream and upstream signal levels?
web1b
join:2008-10-25
USA

web1b

Member


Cable Modem
Status Signal Addresses Configuration Logs Open Source Help
This page provides information about the current upstream and downstream signal status of your Cable Modem.
Downstream Bonding Channel Value
Channel ID 8 9 10 11
Frequency 555000000 Hz 561000000 Hz 567000000 Hz 573000000 Hz
Signal to Noise Ratio 35 dB 35 dB 35 dB 36 dB
Downstream Modulation QAM256 QAM256 QAM256 QAM256
Power Level
The Downstream Power Level reading is a snapshot taken at the time this page was requested. Please Reload/Refresh this Page for a new reading
0 dBmV 0 dBmV 1 dBmV 0 dBmV
Upstream Bonding Channel Value
Channel ID 75
Frequency 30300000 Hz
Ranging Service ID 12305
Symbol Rate 5.120 Msym/sec
Power Level 57 dBmV
Upstream Modulation [3] QPSK
[3] 64QAM

Ranging Status Success
Signal Stats (Codewords) Bonding Channel Value
Channel ID 8 9 10 11
Total Unerrored Codewords 3294288118 3294290031 3294288997 3294289990
Total Correctable Codewords 2640 2371 2489 1995
Total Uncorrectable Codewords 4324 2677 3605 3098
Status | Signal | Addresses | Configuration | Logs | Open Source | Help

© Copyright 2012 - 2013 Motorola Mobility, LLC. All rights reserved.

telcodad
MVM
join:2011-09-16
Lincroft, NJ

telcodad

MVM

said by web1b:

Upstream Bonding Channel Value
Channel ID 75
Frequency 30300000 Hz
Ranging Service ID 12305
Symbol Rate 5.120 Msym/sec
Power Level 57 dBmV
Upstream Modulation [3] QPSK
[3] 64QAM

Yeah, your modem is only locking on one upstream channel and its power level of 57 dBmV is way above spec: »Comcast High Speed Internet FAQ »What should my Signal Levels be?

You need to reduce your upstream loss somehow. Here's some things you can check to see if they may be causing this:

From:
Connection Troubleshooting Tips
»forums.xfinity.com/t5/Ba ··· /1253575
quote:
Inspect the coaxial lines
Inspect as much of the coaxial cable line leading up to your cable modem for signs of extreme bends, cuts, loose or corroded connectors. If possible, try inspecting the coaxial lines from the point this cable enters your home up to the point where it connects to your cable modem. If you see a section of cable or any connectors that are damaged, try replacing the section of cable.

Also, try disconnecting and re-connecting all of the coaxial connections that lead up to your cable modem to ensure each connection is tight, corrosion-free, and that the coaxial tip visible at each connection end is not bent.

Splitters
Each splitter that is added to your cable line will degrade the cable signal slightly and may cause slower connection speeds or frequent modem disconnections. Normally, you should have one main splitter installed where the cable line enters your home with one branch feeding to the cable modem directly and the other branch feeding to all the TVs in the home.

If you have multiple splitters on the coaxial line leading up to your cable modem, try by-passing these splitters and running a single coaxial line directly to your cable modem, if possible. This may disconnect any TVs that may be connected from these splitters but if this improves your modem connection, the problem can be attributed to either a faulty splitter that needs to be replaced or a potential signal problem that may require a technician visit.

Splitters should be of good quality and broadband compliant. The label should read 5-1000Mhz (or 1Ghz).

web1b
join:2008-10-25
USA

web1b

Member

No splitters have been added. The cable modem has been connected the same way for the last 3 years and the loss of Internet problem began suddenly last month.
I can look at or replace the cable connected from the cable modem to the wall and in the cable cabinet located in a cabinet inside. Beyond that, I would need to have Comcast come out to look at outside cables.

Could this also be a sign the cable modem is dying and needs to be replaced or is it definitely are wiring issue?
What's strange about this is that the issue is always resolved by power cycling the cable modem. If the connection was bad, I would expect the signal problem to remain the same after power cycling the modem.
The modem reset "fix" lasts any amount of time from an hour or less to a few days before it needs to be reset again.

telcodad
MVM
join:2011-09-16
Lincroft, NJ

telcodad

MVM

said by web1b:

No splitters have been added. The cable modem has been connected the same way for the last 3 years and the loss of Internet problem began suddenly last month.
I can look at or replace the cable connected from the cable modem to the wall and in the cable cabinet located in a cabinet inside. Beyond that, I would need to have Comcast come out to look at outside cables.

Could this also be a sign the cable modem is dying and needs to be replaced or is it definitely are wiring issue?

While it's possible that your cable modem is "dying," I think it's much more likely that your problems are due to an issue outside of it.

If you are unable to determine/fix the problem inside your home, then your best bet, as you said, is to have a Comcast tech come out to check things outside.
web1b
join:2008-10-25
USA

web1b

Member

I tried unplugging and reconnecting the cable that goes from the modem to the wall jack.
I didn't look at the number right before adjusting the cable, but now the power level shows 50.
Should still be much lower or is 50 low enough to keep a stable connection?
Channel ID 75 73 74 76
Frequency 30300000 Hz 18900000 Hz 23700000 Hz 36700000 Hz
Ranging Service ID 12252 12252 12252 12252
Symbol Rate 5.120 Msym/sec 2.560 Msym/sec 5.120 Msym/sec 5.120 Msym/sec
Power Level 50 dBmV 48 dBmV 49 dBmV 51 dBmV
Upstream Modulation [3] QPSK
[3] 64QAM
[3] QPSK
[3] 64QAM
[3] QPSK
[3] 64QAM
[3] QPSK
[3] 64QAM

Ranging Status Success Success Success Success

telcodad
MVM
join:2011-09-16
Lincroft, NJ

telcodad

MVM

said by web1b:

... now the power level shows 50.
Should still be much lower or is 50 low enough to keep a stable connection?

Power Level 50 dBmV 48 dBmV 49 dBmV 51 dBmV

From: »arris--c.na13.content.fo ··· 0000kUAL
quote:
Upstream Operating Level Range:
:
Level range per channel (three or four channels in the TCS)
TDMA
Pmin to +51 dBmV (32 QAM, 64 QAM)
Pmin to +52 dBmV (8 QAM, 16 QAM)
Pmin to +55 dBmV (QPSK)

 
So, according to the SB6121 modem data sheet, 51 dBmV is the maximum transmit power per channel, and the 4th one is right at that.

It should work right now, but any fluctuation higher due to temperature changes may cause issues.
web1b
join:2008-10-25
USA

web1b

Member

Temperature changes up or down?
I can try replacing the splitters also. Which splitter models are best to reduce this signal loss issue?

telcodad
MVM
join:2011-09-16
Lincroft, NJ

telcodad

MVM

said by web1b:

Temperature changes up or down?

Either, depending on your local cable system.

I find that my upstream levels increase as much as 3 dB on hot days vs. the levels on cold ones.
said by web1b:

I can try replacing the splitters also. Which splitter models are best to reduce this signal loss issue?

See: »Re: [Connectivity] Question about cable splitters--are they all pretty similar?
web1b
join:2008-10-25
USA

web1b

Member

Click for full size
Here is a picture of the splitter that takes the cable from the street and splits it out to the living room and bedroom outlets.
Do all the ports need to be used or terminated to maximize the signal or is there any other issue?
hobbeslover
Premium Member
join:2011-02-20
Newark, NJ

hobbeslover

Premium Member

Terminating will reduce any interference / signal ingress, but it won't make it any stronger. It looks like you have a 6 way splitter but are only using a couple of the ports. It's not recommended to use splitters with more ports than is necessary, especially a 6 way. Replacing that 6 way with a 2 way or 3 way (as appropriate) will improve your signal. You can buy a quality splitter online (Antronix, Extreme Broadband, Commscope are commonly recommended). If you see a Comcast truck, you can try asking the tech for one or you can try walking into a Comcast store and asking for one.
web1b
join:2008-10-25
USA

web1b

Member

Click for full size
I just tried plugging in the cable modem directly into the connection and this is what the signal levels are:
Unfortunately I can't leave it like that because the closet cover won't go back on and the modem needs to be accessible for resets.

Downstream Bonding Channel Value
Channel ID 10 11 12 14
Frequency 567000000 Hz 573000000 Hz 579000000 Hz 591000000 Hz
Signal to Noise Ratio 35 dB 35 dB 35 dB 36 dB
Downstream Modulation QAM256 QAM256 QAM256 QAM256
Power Level
The Downstream Power Level reading is a snapshot taken at the time this page was requested. Please Reload/Refresh this Page for a new reading
13 dBmV 13 dBmV 13 dBmV 13 dBmV
Upstream Bonding Channel Value
Channel ID 75 73 74 76
Frequency 30300000 Hz 18900000 Hz 23700000 Hz 36700000 Hz
Ranging Service ID 12566 12566 12566 12566
Symbol Rate 5.120 Msym/sec 2.560 Msym/sec 5.120 Msym/sec 5.120 Msym/sec
Power Level 39 dBmV 37 dBmV 37 dBmV 40 dBmV
Upstream Modulation [3] QPSK
[3] 64QAM
[3] QPSK
[3] 64QAM
[3] QPSK
[3] 64QAM
[3] QPSK
[3] 64QAM

Ranging Status Success Success Success Success
Signal Stats (Codewords) Bonding Channel Value
Channel ID 10 11 12 14
Total Unerrored Codewords 2675693 2170221 2169079 2170400
Total Correctable Codewords 310 0 0 0
Total Uncorrectable Codewords 2245 537 1380 497
web1b

web1b to hobbeslover

Member

to hobbeslover
The signal improved without going through the splitter, but I still don't know for sure having the lower signal is the actional cause of the problems because the connections have been set up this way with these splitters for a few years, but the dropped connection issues requiring frequent modem resets are a sudden problem of the last few weeks.
hobbeslover
Premium Member
join:2011-02-20
Newark, NJ

hobbeslover

Premium Member

First, definitely replace your splitter because your current setup is not ideal, especially since you're only using a few of the ports. Second, go call Comcast and get an appointment, especially if that's a fresh reboot because you have quite a few uncorrectables.

If you don't replace your splitter, Comcast will almost definitely give you one as part of the tech visit (if not, just ask for one). But you might have issues outside of your house.
web1b
join:2008-10-25
USA

web1b

Member

Will connecting cables to empty ports that connect to rooms where there is no cable modem or TV on the other end help anything?

Even if I did that, it would only use 5 of the 6 ports since two rooms are connecting to an OTA antenna to get better local HD quality and save the additional monthly cost and hassle since Comcast has chosen to scramble everything so that you can't even watch ABC, NBC and CBS by connecting the coax directly to the TV tuner without a go-between set top box and additional remote.
said by hobbeslover:

First, definitely replace your splitter because your current setup is not ideal, especially since you're only using a few of the ports. Second, go call Comcast and get an appointment, especially if that's a fresh reboot because you have quite a few uncorrectables.

If you don't replace your splitter, Comcast will almost definitely give you one as part of the tech visit (if not, just ask for one). But you might have issues outside of your house.

hobbeslover
Premium Member
join:2011-02-20
Newark, NJ

hobbeslover

Premium Member

No. Hooking up more stuff to the ports would help if, theoretically, you were getting ingress/interference entering into your system. By hooking stuff up, RF interference can't get in to those now-sealed ports.

However, the bigger problem is that a bigger splitter automatically reduces signal to each port. So a 2 way splitter reduces signal power by 50% and a 4 way reduces it by 75%. This is the case even if only one device is connected to the splitter. So you can have the exact same cables, with the exact same things plugged in, but if you change out what splitter you have, the amount of signal on the receiving end changes. You're needlessly losing signal by using that 6 way.

But again, you should probably just call Comcast, especially if your issue persist.
web1b
join:2008-10-25
USA

web1b

Member

I'll try picking up a free 2-way splitter at a Comcast office next week or see if Lowes or Home Depot have them in stock tomorrow and then I'll see if the smaller splitter resolves the problem.

owlyn
MVM
join:2004-06-05
Newtown, PA
Netgear CM2050V
Netgear RBRE960
Netgear RBSE960

owlyn to web1b

MVM

to web1b
I had the same problem. Fine during the week, but on weekend mornings, I would get this problem (same error messages as you, too). It started suddenly, after working fine for years. Same as you.

Good news and bad news: The good news is I got it fixed. The bad news is that it took someone I know at Comcast and about three months to get it resolved. It turned out to be as I suspected- someone nearby was doing or using something on weekend mornings that injected noise into the line. Because it was intermittent, it's hard to find. Comcast would have to be monitoring when it happened. Plus, they first need to rule out anything specific to my house. That meant coming inside and checking everything, checking the feed to my house, and working backwards from there. They eventually discovered where the noise was coming from, and put a filter on that person's line.

I don't know how anyone without an inside contact would have managed to get this fixed.

Your best bet is to do as the others have mentioned- first get an appropriate splitter. Check all of your internal connections for any physical problems. When the problem returns, take a screen shot of your modem diagnostics, especially the upstream signal levels. Call Comcast and tell them you need a service call. You may need to disconnect your modem beforehand, so they can't run a check and determine that nothing is wrong. All that being said, a better option may be to post your problem in the Comcast Direct forum, and maybe include a link to this post.
web1b
join:2008-10-25
USA

2 edits

web1b

Member

I still don't understand why restarting the cable modem provides a temporary fix for either the of the two possible issues (weak signal due to splitters or intermittent line noise from neighbor).

If the cause was either of those two reasons, I would expect the loss of Internet access to still be there after restarting the modem because restarting the modem does not increase the line signal and it doesn't remove noise on the line either.

What does restarting the modem actually accomplish in these cases?
If I replace my 2012 cable modem, are there any models that better deal line noise , marginal signal strength and any other temporary connection issues automatically so that I don't need to power them off and on to "fix" them?

Mike Wolf
join:2009-05-24
Tuckerton, NJ

Mike Wolf

Member

I think the better solution would be to address the cause of the line noise and low signal strength in the first place, which would be cheaper then purchasing a new modem. Tech visit?
web1b
join:2008-10-25
USA

web1b to owlyn

Member

to owlyn
said by owlyn:

Your best bet is to do as the others have mentioned- first get an appropriate splitter. Check all of your internal connections for any physical problems. When the problem returns, take a screen shot of your modem diagnostics, especially the upstream signal levels. Call Comcast and tell them you need a service call. You may need to disconnect your modem beforehand, so they can't run a check and determine that nothing is wrong. All that being said, a better option may be to post your problem in the Comcast Direct forum, and maybe include a link to this post.

The connection just went out again.
I then tried to go to 192.168.100.1, but couldn't because the page cannot be reached when the issue happens.
So, there is no way to take a screen shot during this time.
I unplugged the power and reconnected and the Internet came back after the modem fully booted up.

This was in the logs.

Time Priority Code Message
May 15 2016 09:03:07 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=xx;xx;xxx;xx;CMTS-MAC=xx;xx;xxx;xx;CM-QOS=1.1;CM-VER=3.0;
May 15 2016 09:03:06 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=xx:xx;xx;xxx;xx;CMTS-MAC=xx;xx;xxx;xx;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:14 6-Notice N/A Cable Modem Reboot due to power reset ;CM-MAC=xx:xx;xx;xxx;xx;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
May 15 2016 09:01:52 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=xx:xx;xx;xxx;xx;CMTS-MAC=xx;xx;xxx;xx;CM-QOS=1.1;CM-VER=3.0;
May 15 2016 09:01:52 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=xx:xx;xx;xxx;xx;CMTS-MAC=xx;xx;xxx;xx;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:13 6-Notice N/A Cable Modem Reboot due to T4 timeout ;CM-MAC=xx:xx;xx;xxx;xx;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
May 15 2016 09:01:03 3-Critical R04.0 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=xx:xx;xx;xxx;xx;CMTS-MAC=xx;xx;xxx;xx;CM-QOS=1.1;CM-VER=3.0;
May 15 2016 08:36:32 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=xx:xx;xx;xxx;xx;CMTS-MAC=xx;xx;xxx;xx;CM-QOS=1.1;CM-VER=3.0;
May 14 2016 20:12:31 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=xx:xx;xx;xxx;xx;CMTS-MAC=xx;xx;xxx;xx;CM-QOS=1.1;CM-VER=3.0;

What does "Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received" mean?

owlyn
MVM
join:2004-06-05
Newtown, PA
Netgear CM2050V
Netgear RBRE960
Netgear RBSE960

owlyn

MVM

said by web1b:

said by owlyn:

Your best bet is to do as the others have mentioned- first get an appropriate splitter. Check all of your internal connections for any physical problems. When the problem returns, take a screen shot of your modem diagnostics, especially the upstream signal levels. Call Comcast and tell them you need a service call. You may need to disconnect your modem beforehand, so they can't run a check and determine that nothing is wrong. All that being said, a better option may be to post your problem in the Comcast Direct forum, and maybe include a link to this post.

The connection just went out again.
I then tried to go to 192.168.100.1, but couldn't because the page cannot be reached when the issue happens.
So, there is no way to take a screen shot during this time.
I unplugged the power and reconnected and the Internet came back after the modem fully booted up.

This was in the logs.

Time Priority Code Message
May 15 2016 09:03:07 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=xx;xx;xxx;xx;CMTS-MAC=xx;xx;xxx;xx;CM-QOS=1.1;CM-VER=3.0;
May 15 2016 09:03:06 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=xx:xx;xx;xxx;xx;CMTS-MAC=xx;xx;xxx;xx;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:14 6-Notice N/A Cable Modem Reboot due to power reset ;CM-MAC=xx:xx;xx;xxx;xx;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
May 15 2016 09:01:52 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=xx:xx;xx;xxx;xx;CMTS-MAC=xx;xx;xxx;xx;CM-QOS=1.1;CM-VER=3.0;
May 15 2016 09:01:52 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=xx:xx;xx;xxx;xx;CMTS-MAC=xx;xx;xxx;xx;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:13 6-Notice N/A Cable Modem Reboot due to T4 timeout ;CM-MAC=xx:xx;xx;xxx;xx;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
May 15 2016 09:01:03 3-Critical R04.0 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=xx:xx;xx;xxx;xx;CMTS-MAC=xx;xx;xxx;xx;CM-QOS=1.1;CM-VER=3.0;
May 15 2016 08:36:32 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=xx:xx;xx;xxx;xx;CMTS-MAC=xx;xx;xxx;xx;CM-QOS=1.1;CM-VER=3.0;
May 14 2016 20:12:31 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=xx:xx;xx;xxx;xx;CMTS-MAC=xx;xx;xxx;xx;CM-QOS=1.1;CM-VER=3.0;

What does "Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received" mean?

Yeah, i had the same issue. Since i knew roughly what time it started, I monitored the modem and kept taking screen shots as the upstream power increased. Restarting the modem forces it to renegotiate, and it may be okay for a while.
web1b
join:2008-10-25
USA

web1b

Member

I'm going to replace the 6 way splitter with a 2 way to see if it helps since I only use Comcast for the cable modem in one room with a TV and cablecard in another room anyways.
All the other rooms are connected to the OTA antenna plus Roku, AppleTV or Tivo.

However, I think there should be a cable modem produced that is smart enough to renegotiate the connection on its own without having to pull the plug to force it.

owlyn
MVM
join:2004-06-05
Newtown, PA
Netgear CM2050V
Netgear RBRE960
Netgear RBSE960

owlyn

MVM

said by web1b:

I'm going to replace the 6 way splitter with a 2 way to see if it helps since I only use Comcast for the cable modem in one room with a TV and cablecard in another room anyways.
All the other rooms are connected to the OTA antenna plus Roku, AppleTV or Tivo.

However, I think there should be a cable modem produced that is smart enough to renegotiate the connection on its own without having to pull the plug to force it.

They do renegotiate internally until the US level gets too high. At that point, they should reboot themselves, causing your internet connection to drop,a nd when they restart, they begin to negotiate at the lowest US level until they get a connection. As the noise increases, the problem returns.
hobbeslover
Premium Member
join:2011-02-20
Newark, NJ

hobbeslover to web1b

Premium Member

to web1b
Just a note that Home Depot or Lowes won't carry what any of us consider a quality splitter. If you can't get one from Comcast, I'd buy one online (Extreme Broadband, Antronix, Regal, Holland, or Commscope). Probably about $4.

I still think you're probably going to need a tech visit at the end of the day, but good luck.

maxbrando
Premium Member
join:2014-06-01
Netgear WNDR3700v4
SMC D3CM1604
ARRIS TM602G

maxbrando

Premium Member

said by hobbeslover:

Just a note that Home Depot or Lowes won't carry what any of us consider a quality splitter. If you can't get one from Comcast, I'd buy one online (Extreme Broadband, Antronix, Regal, Holland, or Commscope). Probably about $4.

The solder back klien tools and ideal ones should be ok. I would just avoid any monster cable non-sense or any ge, rca/audiovox , or magnavox/phillips epoxy backed junk.