I've been having these same problems with my TiVo Series 2 since about mid-March (presumably, when the software was updated to 7.1). I received the 7.1b upgrade 3 days ago, and last night's taping of "Lost" included two instances of the same kinds of problems: picture freeze with loss of audio for a second or two, then black screen very briefly, then pixelized reforming of picture, then resumed playback. Total glitch time is about 5 seconds or so per occurrence. It's very annoying, and it doesn't appear to be restricted to particular channels (I have cable TV). So the 7.1b upgrade has not fixed the problem for me or others. Keep working on it, TiVo, and how about rolling back the software to an earlier version until you get the bugs ironed out? I'd hate to have to dump TiVo for a different DVR, but this is unacceptable.