Icture on std tv channels suddenly have top bottm bars
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out of the blue tonght, std channels display top and bottom bars. No changes made on X1 box to cause it. Tried looking at Video setting on box and has not changed 1080i and zoom. Comcast reset box twice, no help. Unplugged box at their request and restarted it when they told me to, same problem. Nothing helps and just started today. Only thing left is that Comcast has a problem, very frustrating. What is going on?