Perhaps a month after having been switched from the large gray DVR box to the smaller black DVR box, started getting breakup/pixelization on 3 of 4 local HD broadcast channels on Comcast cable. Initially checked connector at back of box and at the wall, as Comcast suggested, with no improvement. Finally dawned on me that had the coax running to/through a combo AC/phone/coax surge protector. Removed the surge protector from the coax circuit, so had a single coax run from wall to box and problem appears to be fixed.
No idea what changed. Will have to read up and see whether is practical or worth considering purchasing and installing a replacement coax surge protector.
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