I've had several recordings cut up into 2 or 3 segments. Signal seems strong. Sometimes I get the whole show, just 45 and then 15. Sometimes I'm missing segments... I think usually the end.
Either poor OTA signal / weak signal. Is it only on a specific channel?
Or a bad HDD.
I've noticed it on two channels. The rest of the recording looks crisp. Hard drive is a couple years old. May have to take it off and run some diagnostics.
Also see this thread, similar issue.