Comcast XFINITY → [Connectivity] I hate cold weather

Just as an update, as I suspected, as soon as the temp climbed above ~ 26-27F today, here are my signals now with an outside temp of 29 F:

Frequency 651000000 669000000 687000000 693000000
Lock Status
(QAM Lock/FEC Sync/MPEG Lock) Y/Y/Y Y/Y/Y Y/Y/Y Y/Y/Y
Channel Id 1 4 7 8
Modulation 256QAM 256QAM 256QAM 256QAM
Symbol Rate
(Msym/sec) 5.360537 5.360537 5.360537 5.360537
Interleave Depth I=32
J=4 I=32
J=4 I=32
J=4 I=32
J=4
Power Level
(dBmV) -7.12 -8.27 -9.24 -9.38
RxMER
(dB) 35.60 35.97 35.25 34.77
Correctable
Codewords 943 933 995 1054
Uncorrectable
Codewords 669 659 542 1571

Upstream about the same

Channel Type 1.0 N/A 2.0 2.0
Channel ID 12 N/A 10 11
Frequency
(Hz) 22000000 N/A 36200000 29400000
Ranging Status Success N/A Success Success
Modulation 16QAM N/A 64QAM 64QAM
Symbol Rate
(KSym/sec) 2560 N/A 5120 5120
Mini-Slot Size 4 N/A 4 4
Power Level
(dBmV) 38.00 N/A 41.00 40.00
T1 Timeouts 0 0 0 0
T2 Timeouts 0 0 0 0
T3 Timeouts 0 0 0 0
T4 Timeouts 0 0 0 0

Already seeing pixelation and drop out on my TV channels on the 700+ MHz. Lower frequencies have not changed at all in power level are are around +3 to +4 db. This has been going on since November 2012 with numerous tech visits. I have had a ticket open with the executive support and have contacted the local tech supervisor a few hours ago. As the temp goes near 60F this weekend, my service will go to heck. Basically after dealing with this for more than a year, it may be time to switch to FiOS like most of my neighbors.

The issue is completely repeatable. As soon as temps drop below ~27F, my upper frequencies above 300-400 MHz jump by about 10-12 dB almost instantly. When the temp then increases back towards 30F, like a switch is flipped they'll then drop back down by 10-12 dB. Since October it was jumping from from +2 to +14 dB, but since Tuesday 1/7, it's now jumping from -10 to +4. I have all of this logged and Comcast should be able to track it. They should be able to pinpoint the problem after months of this. Do they not just want to spend the $$ for the repair? The techs have seen it outside my house, but I guess I'm the only one who cares to call in

Your problem is almost exactly the same as I had that was fixed requiring two techs - one studying to be a line tech and a line tech called in on his time off. This occurred in the dark on a cold, windy evening into the night. Took them several hours to fix the problem. My description of the problem is given on the 2nd page of:

»[Connection] Bad node / outside line again...

Comcast has excellent techs here. They're smart and willing to listen to customers. Of course, your problem may be different, but you can see the problems with aging infrastructure that show up during big temp changes. Be persistent!!

One of the reasons I've stuck with Comcast for so long is that the visiting premise techs have done a great job with helping narrow down the issue and work with me. But once it gets escalated to the maintenance/line crews, nothing seems to get resolved. I now have direct contact with their manager and he confirmed tonight that they can see the jumps as well and he'll get back to me tomorrow. Since this has been going on for months, I can only be persistent for so long, but I am willing to give it another shot as long as they stay in contact.

It just hit about 25F tonight, and surprise, my levels just jumped back up to a good reading:

Frequency 651000000 669000000 687000000 693000000
Lock Status
(QAM Lock/FEC Sync/MPEG Lock) Y/Y/Y Y/Y/Y Y/Y/Y Y/Y/Y
Channel Id 1 4 7 8
Modulation 256QAM 256QAM 256QAM 256QAM
Symbol Rate
(Msym/sec) 5.360537 5.360537 5.360537 5.360537
Interleave Depth I=32
J=4 I=32
J=4 I=32
J=4 I=32
J=4
Power Level
(dBmV) 3.09 2.44 1.84 2.15
RxMER
(dB) 37.09 37.94 37.64 37.36
Correctable
Codewords 1105 1060 1188 1253
Uncorrectable
Codewords 669 659 542 1571

I can tell you as soon as we hit 30F tomorrow, things will tank again. I'm kind of worried that they know what the issue is, and just don't want to spend the $$ for a repair that apparently I'm the only one complaining about