I have dealt with this issue for a long time, probably a half a year, the box used to work fine with my TV. I tried all the usual things, new cables, purchased a power plug to restart it everyday, Got a new X1 4K box and nothing worked. I believe this is a software issue in perticular with my TV model of a samsung. The reason I state this is becuase I found a way to patch the issue. I bought a Yamaha receiver that ports 4K HDMI thorugh the receiver. The comcast box plugs into the receiver and the receiver out to my TV. I have been using it for a week now with this new set up and it has never went to black screen. Prior to this I had black screen happen sometimes twice in one day and required to unlug and replug. Now I no longer suffer an issue. This is terrible that the software problem cannot be fixed with comcast so permit me to have it plugged straight into my Samsung UHD TV. But I am in bliss now that when I turn the TV on it actually works, I was at my wits end, looking into a possible new TV or Tivo. I hope this helps some people.
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