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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
Comcast washed their hands of it. As always in telecom, it's blame the other guy. The router is a new Synology model. Works great with the C7100V. For cable TV viewing, the TVs are not taking digital from the router. For web-based channels, they are and work perfectly. It's only the, what I beleve, is the lower frequency cable info that is getting garbled. There is a difference between the C7100V and the CM3050V that nobody seems to recognize.
There a model# for the Synology? Maybe the new router needs to be checked by the Mfr support people.
The different between the C7100V and CM modems are that CM series modems are only modems only, no router or wifi there. C series anything is a modem with built in router and wifi.
I'd get with Synology first and have them check there router with your TVs.