I can't be completely certain why this is happening to you, but I have experienced these "missing" sections of shows when the cable signal dropped while recording.
If there is no signal to record then it just doesn't record anything until the signal comes back. This will appear as a partial recording, and the over all length of the recording be be shortened by the amount of time the signal was lost.
OK, Just checked end of recording, movie was over with credits 131 minutes Tivo recording ran 135 and showed part of next show,, movie should run 136 so 4 minutes of movie is missing, recorded on Filmfest Voom channel
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