The problem has developed for me within the last few weeks but is PLAYBACK only. In some cases, affecting programmes recorded six months ago.
The fix is to back out of the list of recordings, then reselect and play from the start. If needs be, fast forwarding through to the point where it said that the playback had finished.
We are in North London and have had the unit for about 18 months without this problem. I'll try a reset/retain progs as suggested.
HIGHLY irritating.
Thanks for the information of this thread.