Great suggestion about tempurature swings! I'm in Chicago and the handoff between Comcast/my cables are in the garage.
My todo list:
Check the connections. Retighten.
Going to spray some electrical contact cleaner as well.
Remove the splitter and go direct to modem.
I am using my own cable modem (ARRIS SURFboard SB8200)
My latency/loss issues are entirely over wired connections (CAT6A) My switches are managed and I don't see any error counters on the ports involved. But I'm going to go recheck incase I'm making a bad assumption.
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So long story short, Comcast will not help me. They will only provide basic troubleshooting, restart modem, change cables, don't use your router, etc. But my problem is more complex than that. Comcast says they will send a technician out, but it's been 4 months and they just won't accomidate in our current pandemic economy. So I'm turning to the community forums for assistance. TIA to anyone with the time to read and provide suggestions.
So what's my problem? Well, the end-user experience is high-latency spikes, packet-loss, etc.
When I inspect my cable modem logs, I see very high counts of errors/corrections (see images). When I try and communicate this to Comcast support, they have no idea what I'm talking about and go back to the, unplug/replug/try-again troubleshooting steps.
So here's my question, do you think this is a sigal strength issue? Or potentially a cabling issue from Comcast to my house?
The environment is a single family home with only 1 splitter in the chain to TV/modem. The cabling install and splitter was provided by Comcast 5 years ago when I 1st moved in. I had great service up until 1.5 years ago. Conviently, I'm in a 2 year contract and I think Comcast is not inclined to help a customer who's locked in.
1st image is the modem after being on for a long time (weeks). Note the high error counts.
The 2nd image is right after reboot (minutes). Note the channel with an enormous amount of errors.
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