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New CM205V Interferes with TV Signal
When a CM2050V is connected to a three-way coax splitter (the modem, and two TVs to Xfinity Voice/Data/Cable television service, it disrupts the signal to the two tvs. Disconnect it, and the TVs are...
Way too many correctable/uncorrectable errors for a 24 hour period of time.
DOCSIS 3.1 is backward compatible with DOCSIS 3.0. I do not think DOCSIS 3.1 is backward compatible with DOCSIS 2.0. If you are looking at DOCSIS 2.0 hardware, you want to check the coax type to ensure it is correct for the current DOCSIS 3.1 connections (RG6).
What were the upload/download throughputs with your new splitters in place?
You might find some ideas in chapter 3 of this reference: https://www.duckware.com/tech/solving-intermittent-cable-modem-issues.html
I have tried disconnecting one TV so incoming coax to split modem and 1 TV. I think that would be roughly the same? Didn't fix it. And remember, the C7100v has worked fine for at least 8 years. Here's some info from the modem when it was installed (and not working). Nobody knows with Downstream Status shows Poor, or whether that would make a difference. And, as you recall, the C7100V works fine. I'm thinking defective modem, but have no way to test or confirm. To put it back online involves activating again...
CM Status: Good
Downstream Status: Poor
Partial Service: Poor
Cable modem is in partial service mode. Your service provider might be under maintenance. Most of the time it won't affect your traffic and will automatically clear when work is complete.
Downstream Power Level: Good
Downstream SNR Level: Good
Upstream Status: Good
Upstream Power Level: Good
Please post the data on that same page that is down farther. Please scroll down.
Also include the Event logs page as well.