On a simpler note, check the obvious first - schedules set on the charger, the charger app or MyBMW app, or in the car. And it would help to have a little more - as in any - information: type of EVSE ("charger"), settings, when it gets interrupted (immediately, one hour in, middle of the night), GFCI thrown, after 50%, 70%, 80%, same time each time, randomly, sometimes, all the time, type of connection? Like that.
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