Last Monday and this Monday my 9 and 10 o'clock shows were not recorded because Tivo claimed that there was no video signal available for my NBC HD channel. It's odd, because I get a signal for every other channel, even for the non-HD counterpart... Also when I switch off of the Tivo and to the regular cable box I can see and hear the picture clear as day! I know it works from 8:00-9:00 because Chuck records with no problem, Heroes and Journeyman on the other hand, do not. I don't understand why! Anyone have any ideas on how to fix?