Update: the dealer diagnosed with low voltage faults. Reprogrammed the PCM and replaced the battery. So far do good. I now turn off auto start-stop as soon as I start it.
Total electrical power failure on my 2021 BB with 23700 miles. Everything died in the middle of traffic, not even emergency flashers worked. An off duty cop in his personal vehicle pulled up behind me and blocked traffic until a patrol car and tow truck got there is a steak dinner for him and...