Originally Posted by richbrew
This sounds almost like something I have seen occasionally. I have seen where TiVo tries to record a suggestion on a channel that I have selected in channels, but don't actually get. Since there is no signal, you can't ff/rw, and no recording is saved. Have you checked in the suggestions folder to see if there is something recording in there?
Originally Posted by celtic pride
If you have tivo suggestions turned on turn it off.
He already stated that Suggestions are off. My initial thought was the same as Unitron, but the more I read, the less likely that was. The Teleworld program exhibits this behavior, IIRC, but since the OP states this happens on up to 3 tuners at once, on varying stations, it's not Teleworld.
Really odd that the recordings aren't kept. It's clear there's a video signal on those channels, since the OP indicates he can FFWD/REW the channel.
The only thing I would suggest is to turn on Suggestions for a few days, see what happens, and then turn them off again. Maybe it's a quirk in the software such that it's scheduling Suggestions, recording them, but not displaying the recordings in the Suggestions folder since they are supposedly off.
Another thing to test. When you see it happen again, start recordings on the other available tuners, and then try to change the channel. If it's the theoretical Suggestion quirk I've mentioned, it should change the "unavailable" tuner and stop the recording.