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Hello GUNNY3, pixelation is primarily caused by a poor signal or a bad spitter/coax cable within your network. Since the problem happens on both TV's and on just a few channels I would have to lean more towards the signal causing the problem. Have you tried rebooting your cable boxes? When was the last time you had a tech out to evaluate your connection?
I have escalated your issue to the Comcast Team available to these forums. Check back often for a reply in this thread or via Private Message from a Comcast Official Employee.
I have pixelated channels, but only the traditional "cable" channels like FX, FreeForm, TBT & SCIFI. "Regular" stations like 4, 5 and 7 are fine. HD in all cases and it only seems to happen at night. If I have a tech come out at noon (for example) I'm almost certain they WON'T see it happen. I see it on both TV's and both TV's have a homerun RG6 cable from the Cable box to the (Comcast installed) splitter. Any thoughts?