My 2021 330e has a range of amperage maximum when plugged in from 6-16 amps. Mine randomly defaults to the 6 amp setting after being set to 16. If I don't take notice when it changes it fails to charge completely overnight. Sometimes it goes a week and sometimes it is a daily reset that's required. The BMW genius line had no fix and claimed not to have heard of the issue. Any ideas? Trying not to make it a dealer visit which is an hour away (and not sure they'll know what to do).