I've been having some problems for several months (http://www.tivocommunity.com/tivo-vb/showthread.php?t=264062) with my upgraded HD TiVo, purchased in late April from Weaknees. Now, the most serious, is that my recorder periodically (every one or two weeks), loses all its channels and fails to record anything. Nothing special seems to precipitate this problem (no weather, blackouts, etc. and no problem with other electrical appliances, including four additional TiVos). Though the unit will play recordings in Now Showing without error, if you switch to Live TV, you can't see anything. All channels have "Channel Not Available" banner and Recording History indicates that recordings failed due to "power failure," though there were no electrical troubles with power. A forced restart corrects the problem, for a while, but it seems to always return. I've had it happen now three times since my original posting a month or so ago. It's really annoying that I can't rely on my very expensive TiVo to do what it's supposed to, i.e. record programs. (In this case, we'd been super-busy since Saturday and hadn't watched TV all weekend. Sometime Saturday night the recorder failed--losing all channels--and, since then, hadn't recorded anything. I only discovered this when I came home from work on Monday and sat down to watch something.) Is anyone else experiencing this? Any suggestions, ideas?