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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
Got a screensnip of the cable connections that shows upstream/downstream info?
The C7100V is only docsis 3.0 vs the CM is a docsis 3.1 device. the recommendation from Kitsap could be right on in the interference issue.
I'd also try the double splitter before splitting for the cable tv connections. But a lot could depend on your signal that you have. Thats where that cable connections info comes in.