I haven't experienced the issue you described, but I have seen something similar in my previous 2018 F36. I took it in for an oil change and after picking up I noticed that there was zero sound from the speakers. No bluetooth audio, onboard navigation or even the PDC gongs. Despite that all other functions seemed normal. Restarting the engine did not help. Had to park it for a few hours and then the sounds were back on the next start...
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