This has never happened before. I was visiting a friend's place and we went out for dinner. I drove. Noticed during the drive that 'triple blink' wasn't working. Checked later and every custom setting has been defaulted. Bass, treble, EQ, seat heater bias, lock confirmations - the lot. How very odd.

Now: it may be interesting to note his house is near a radio tower that renders the comfort access inoperable, and when I went to start it later this evening the car couldn't see the key in my pocket. I had to move it nearer the dash before it would start. How very odd.

 

Update: everything went back to normal. All the presets are now the same as they'd been before the 'blink'. How very odd.