oh no its starting again...

sounds like the typical becker (manufactuer of the system) teething problems...

of course these things can only be called teething problems if they eventually go away as the model's life progresses.

however, if you take a look at the 03-> porsches, there have been longstanding problems with the head units/amps/etc.

my suggestion is to bring this to the attention of the dealer and ask them to replace the amp/ head unit/etc