Black box in center of tv picture - XFinity

The past few days when I turn on my tv that's connected to the main comcast box there is a big black box that is appearing right in the middle of the picture. I can see the sides of the picture but not the middle. At first it would disappear if I turned the tv off and on, but yesterday and this morning it's not doing that today. I called for a reset, but that didn't work. Is it a problem with my TV or Comcast issue?

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