My TCL Smart TV is going black for a few seconds the comes back on.

My TCL Smart TV is going black for a few seconds the comes back on.

My TCL Smart TV I have had for several years has now started having a problem the screen goes completely black and is gone for a few seconds and then comes back on again. This is happening only when I watch YouTube and Netflix which is connected only by WiFi. I have looked up the problem on the internet and found that is happen to others who have cable which I do not.

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