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Now that this thread is revived.. I completely forgot to say.. this happened to me sort of. It was during the summer COVID but I went to pick someone up local and couldn't figure out why my phone was silent so I just flipped it off bluetooth and spoke on the phone. After when I stopped the car I noticed no sound from the radio, also no warning chimes. I turned on and off the car with no luck. Then I thought maybe I coded something out or something screwed up (I probably had coded something a day or two before with bimmercode). I was loading up the car and heard a little scratch through the speakers, and then a warning chime went off. So the car might have "timed out" and reset something. Certainly even if you turn on and off the car the actual system stays dormant until it "goes to sleep" 10-15 minutes later so that might have been it. I have never had that happen again either no matter the weather.
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