So, I realize this is over 2 years old, but I have an F26 and have this exact same issue, so it’s definitely BMW-specific (not a radar detector or dropped wristwatch!). I’ve had the car for 2 years and I’m fairly certain I’ve heard it in the past, then it stopped for awhile, and now it’s back again and has happened twice today, both times exactly as OP states, about 2 minutes after driving away from my driveway. It’s not the usual BMW chime, it’s like a faint radio beep and I swear it comes from the door speaker, possibly all speakers, I’m just obviously next to the drivers door. I’ve read plenty about the 3 beep hourly alarm but it’s clearly also not that because it’s just one beep and I’m not sure I’ve ever even seen the hour alarm in newer models anyway. Did the OP ever shed light on this?
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