The issue is an incorrect capacitor was installed inside the main plugin box - in SOME of the early units, both BMW brand and AeroVironment/Webasto branded.
Aerovironment / Webasto branded:
https://www.homedepot.com/hdus/en_US...calls/2018.pdf
BMW provided chargers (serial number list included):
https://static.nhtsa.gov/odi/rcl/201...8V652-7122.pdf