Did it record absolutely nothing, so that there was no entry for the show in the Now Playing List? I'm OTA only, and when that happens to me (due to a channel being off the air) the TiVo will try to pick up the next showing on that channel or (if there are no more) the next showing on a lower priority season pass for a different channel. It takes a little while for it to notice, but 2 or 3 hours should be more than enough. It won't record from a different channel if there is another showing scheduled on the higher priority channel, even if that isn't for another day or two.I had a series recording fail due to no signal or something like that (probably SDV issue). Much to my surprise, Tivo did not pick up the next showing of the same episode (2 or 3 hours later), and the Recording History indicates that it was because the same episode was recorded/scheduled within 28 days. Is this a bug, or is it because Tivo needs more than a couple of hours to recalculate stuff and figure out that the episode was not actually recorded, and it needs to pick up the next showing? I can not check whether it figured it by now, as no other future showing exists. It seems quite lame not to do the recalc on the spot when a recording fails.
Being OTA only, I wish the TiVo would keep track of error counts and allow the next showing of the same episode to be recorded automatically if the uncorrected error count exceeds some threshold. Poor reception conditions (storms or whatever) can cause me to get a recording that is there, but too glitchy to be viewable.