Anybody come across this?

I'm using MyStuff and the correct firmware which is compatible with this software.

Yes, got up this morning and the Toppy was on BBC2 (not recording) after recording something overnight. Happens once every few months.

If you definitely didn't press any keys on the remote control during the recording, I would just switch the box off (not standby) for a few minutes to reset everything.

Yep, I think I may have pressed something.