[noonystock]

OK, here's another farfetched idea. We've already established that gapless playback is an attribute of the Audio CD standard. It was that standard which fueled broad consumer uptake of audio CDs in the 1980s and beyond. As I understand it, all hardware manufactured and sold to play audio CDs must comply with that standard (that's the point of a standard, eh? ;-) Based on your situation, BMW seems to be out of compliance having sold you hardware which does not support (at least this specific aspect of) the Audio CD standard. Identify the association that oversees manufacturer/seller compliance with the Audio CD standard (there must be one, e.g. RIAA for the recording industry in general) and report BMW for selling non-compliant hardware...