I was searching for the same thing and came across this thread. Happening on my MX and the same message from a couple years ago has come in several times. Usually after a reboot or deep sleep. I also have a Samsung phone, 9+. Seems most users reporting this is on a Samsung. I have had my car for 2.5 years, and this only started after my upgrade to MCU2 which I believe all M3's have.