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My e89 (z4) does this. The car always resets volume to a low level on start, to prevent loud noise when you start the car. Imagine you've had the volume on very loud while out for a fun drive. Next morning you get in and are blasted by the loud volume you had when turning off. Not fun. So the car drops the volume down. On my e89 this is to a volume where its listenable but on the quieter side. I have no issue with this, saves me from having a heart attack when blasted with unexpected loud noise!
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