I have been having a problem with the sound on one tv since I moved into my house one year ago. After the tv is in on for a few minutes, the sound goes completely off. The picture is fine..I actually have a new tv and it does it on this one too. The only thing that works is to reboot the box. I've had the box and all cables replaced several times..techs have been out and can't figure it out..any suggestions?

"Sound," is about XFinity-Comcast Television.

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