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Same happened to me today
My 2008 M3 Premium Sound was parked in my garage overnight. Opened the door and the loudest screaming static noise was coming primarily through my Left speakers. My ears are still ringing. I dropped it off at BMW this morning but I have a feeling those idiots wont find anything wrong with it.
Sorry, I know this is an old post but doesn't seem like anyone has posted a problem like this since.
Thanks
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