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Yeah, my 2011 328i has had two such episodes. I came out one night in February after work and before I opened the car I heard it buzzing very loudly from the rear speakers. Nothing was turned on, the car was closed and locked. Nothing I did could stop the buzzing. It lasted until I got home and was still buzzing when I locked it for the night. I thought about trying to disconnect the battery in the rain but decided against it. I came back to the car after an hour and it had stopped buzzing or gone to sleep.
The BMW dealer said that they could not find anything wrong with the stereo or the amplifier. So I drove on.
Then, about a month ago, it happened again, not as loud this time and did not last as long. It quit pretty quickly. My local audio guys think that one channel of my amplifier is going bad. I told the dealer that but they still did not find anything wrong with the amp.
I am now prepared to pull a fuse if it happens again and won't stop.
Hot Toddy
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