Sound changes blinking screen



Vizio TV and xi6-A box. Tv blinks on and off constantly. TV moves between stereo and Dolby. This doesn’t happen with any other input. SmartCast is fine. Airplay is fine. PlutoFreeTV all works with sound and no screen blinking. Restarted router = no change. Would love any suggestions.

"Sound changes blinking screen," is about XFinity-Comcast Television.

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