Been having issues for days, only on certain channels. Read where an update Xfinity sent to X1 boxes was causing issues for some customers. No, it is not always a cable/connection issue, but all of my indoor connections were checked, X1 box reset, reset signal sent from Comcast to reset box, blah, blah, blah!. Two of our 4 LOCAL channels are pixelating too frequently to even watch. What may help temporarily, is to manually change the resolution on the X1 box. The box is probably set to automatically autotune to the "BEST AVAILABLE RESOLUTION" based on your television. 1 - Press "exit, exit, exit, 720" on your X1 remote. This sets the resolution to 720. THEN ... 2 - Press the "XFINITY" button on the remote. Click the "GEAR ICON" (Settings), click "Preference", click "General", choose "Prefer Best Available Resolution", click the "ENTER" button to turn off. I personally went back into settings and changed my resolution to "1080i". So far this seems to be working for me. We have a technician coming out next week. Maybe we can get the issue resolved and go back to 1080/60. Hope this helps sombody!
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