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my Sonos one speaker fades in and out when listening to TV since I stopped My cable TV. I still have Fios internet and the speed is much faster now. Sonos sound bar and rear surround speakers seem fine.

That generally suggests some sort of wifi interference  between your router and the Sonos One, but I’d recommend that you submit a system diagnostic within 10 minutes of experiencing this problem, and call Sonos Support to discuss it.

There may be information included in the diagnostic that will help Sonos pinpoint the issue and help you find a solution.

When you speak directly to the phone folks, they have tools at their disposal that will allow them to give you advice specific to your Sonos system and network.