Having issues with my cable internet out of Crestview, FL. Was good for almost 4 years, enjoying Preferred speeds between 10-20Mbit. Noticed one day that my internet could no longer stream 720P video, which it could normally tear through. Then noticed that my Cox Internet Speed Check and Speedtest speeds would fall between 2-5Mbit, well below Preferred speeds. Since then, I've been without wireless router, with two different ones I own (Linksys WRT54GL and E2000), tried two different modems (Motorola SB5100 and Linksys CM100), and the problem still occurs. It gets slow, I reboot the modem or the Cox tech sends a signal to reboot it, it temporarily restores speed between 1-6 hours then degrades again and does not come back until I reset again. The attached picture shows my slow speeds, and shows fast speeds again after a reboot of my modem via me power cycling the modem, resetting from within the config, or a re-provision from a chat/phone tech.
I've had two Cox technicians come to the house now, and I'm on the chat and phone with Cox service nightly to make logs to my account with the issue. First technician replaced the splitter outside the house (took it from 4 way to a 3 way), and tried to give me a signal dampener to reduce the power level of the downstream from +9db to +4db. I've taken it off since then because a.) it didn't help and b.) the second technician said the power level was fine with just replacing the 4 way to a 3 way (took it from +9 to +7).
The first technician also replaced the ends of the cables at the green box in the yard that splits the cable between me and my neighbor, and at the gray box attached to my house, and then gave me a new cable for the room the cable modem is in. The second technician did absolutely nothing but look at my power level and signals and then left. He recommended a DOCSIS 3.0 modem, although the first technician said it wasn't needed due to only being on Preferred speeds. I've asked chat/phone + the first tech if I am competing for bandwidth on the single channel and if that's causing degradation of the signal over time and they insist that can't be it. It doesn't sound like it would be the issue either. This came out of nowhere one day after 4 solid years of use, and it hasn't been good since.
Frequency 831000000 Hz Locked
Signal to Noise Ratio 39 dB
Power Level 7 dBmV
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
Channel ID 3
Frequency 24512000 Hz Ranged
Power Level 44 dBmV
That's a snapshot from my SB5100 right now, which is currently my active modem. I could always switch back to the CM100, but it wouldn't fix anything. Two technicians (contracted out from Comcast no less? That's horrible Cox!!!) and 14 days of chatting with tech support. I'm desperate for help...both myself and my gf work on ethernet networks for DoD on a daily basis, and I along with the Cox techs that have been out can assure you that the cause of this issue is not inside the house. Had this issue in Yorktown as a customer. Took a month of calling and a talk with the district manager to finally get an engineer to fix an issue with the junction box for the entire neighborhood. I don't want to go through that here, but I will if I must. I'm hoping I'm just missing something here that maybe the technician missed, or that someone else can confirm this issue with either slow speeds in NW FL or that not being on DOC3 is causing this issue.