Same problem with me, and a few others I have spoken to on various forums. No one has ever seemed to get to the bottom of this. Even taken this to the main dealer and they don't seem to have a clue. This after they charge £120(+vat) an hour to look at it. Did you ever find out what has caused it. Changing the settings on vag com didn't help us. They revert back after parking. I believe it is probably a battery on the MMI circuit board that is worn out and forgets some of the settings. All the audio etc stays in memory but not sure if this is stored on seperate amp memory.