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I've been having a similar problem with FM. Just figured it out. Radio always works when I use the key to lock and unlock the car (pressing the buttons on it). Radio usually does not work when I use the comfort access feature (touch the door handle to unlock, and the sensor by the door handle to lock). Sounds like a software problem to me, maybe related to comfort access feature.
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2013 535xi, Carbon Black, beige interior, M Sport package, HUD, DDC & ARS, ACS springs, Kelleners wheels
2010 Z4 35i, Crimson Red, beige interior, 6sp manual, Adapative Suspension
2000 528i, Cosmo Black, beige interior, Sport package (retired)
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