I've had this problem occurring for a while now, and it's not power outage or signal loss.
At first, I thought it's the Hard Drive failing, which I think is the case anyway, so i've installed a brand new HD.
Guess what, the first two recordings have both failed. The recording shows the programme, a broken recording symbol, and the time it started, followed by the same time. Normally, for a half-hour programme it'd be 18:00 - 18:30. The failed recordings show 18:00 - 18:00
I've retuned, i've check the new disk, and it's fine.
Any ideas?