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Why all my tvs blink off for a few seconds

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Why all my tvs blink off for a few seconds

Why my tvs blink off for a few seconds
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Re: Why all my tvs blink off for a few seconds

The signal reaching your main cable-box is either weak or you may have a loose coaxial-cable connection inside your home. I would loosen and retighten all connections inside.

 

The same might be true for outside connections from Comcast transmission cable. I would either go to the Comcast site, sign in and do the trouble shooting provided, or call Comcast to check for you.