The lower half of the screen flashes white and the sound pauses

The lower half of the screen flashes white and the sound pauses

My vizio led 4k tv. Has random lower half white screen flashes and at the same time the sound cuts or pauses it does it on youtube,netflixand when im playing games and i turnd it on once and the screenshowd my xbox dash in 3 boxes and bars of diffrent colors at the bottom. But its only done that once so far. And its a brand new tv. Any help would be appreciated?

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