T3+T4 Errors with High Uncorrectables - Intermittent Internet Cutouts
I'll try to keep it short - I've been having severe internet issues (periodic cut-outs 1-2 times an hour + 2-20% packet loss). I found on my cable modem logs that I have specific channels with incredibly high uncorrectables (in the tens of millions after a few days) despite a strong SnR (approx 40 on all). Checking my logs, my modem is regularly throwing T3 and T4 errors.
For troubleshooting, I'm in an apartment complex and am limited in what I have access to regarding cable lines. I've tried the other cable jack in my unit, unscrewed the wall plate and plugged straight in, factory reset everything, etc. My cable modem worked fine in a previous building as of July, so I'm fairly confident it is not my hardware. Bonus - I connected to an open CoxWifi in my building that's nearby and found similar packet loss, so it seems building-wide.
Logs are here if anyone has advice: https://imgur.com/a/iuOIizW This is from a CM-500 cable modem that I own.
My research indicates that this is likely an issue outside of my control. When I contacted support, they said in summary: "our end looks fine because your SnR is good, so talk to your cable modem manufacturer" and insisted it was my cable modem. Even when I mentioned my modem working fine in other buildings, their response was "your cable modem could be holding onto settings that a factory reset doesn't fix." This cable modem has moved buildings without issue before.
The dilemma - when I asked about a tech, they stated that it would be $75 if they didn't find an issue on their end. I'm a graduate student - buying a new cable modem like it's whatever or losing $75 if they don't acknowledge an issue isn't an easy proposition.
Does anyone have advice on how to most effectively navigate this without potentially spending hundreds?