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Xfinity 4K STB Audio/Video Issues

Regular Visitor

Xfinity 4K STB Audio/Video Issues

I replaced two STB w/the “new” 4K streaming STB, and from day 1, (3 months), I have had audio (black screen) and video (nothing) issues, lasting 1-2 seconds @ a time. It’s very random. Sometimes it’s 5 minutes after turning on the tv/STB or it could be on for an hour w/no trouble then it is. Ex. Let’s say I’m watching a game, and for no reason, I have a black screen.
Other issues isn’t that, although I have gone into the settings and ensured that I have deleted the surround sound setting, in the STB, nothing I watch is in surround sound. Didn’t have this issue before switching boxes.
Both STB are connected to home theater systems and Sony TVs. I’m sure I’m not the only 1 w/these issues. Helping me will help many.
The new boxes are great, as they are very small & there’s no need for the cablewire from the wall...just connect to the network and programming streams to the STB.