Could be just as you thought. Sometimes you just need to remove ALL power from these BMW modules to reset them. Had that happen with my radio some time ago and removing the plug on the rear of the head unit and reconnecting cured the problem.
Weird!!
P.S. Go one better- Buy yourself a battery powered jumper box. Keep it charged and in the trunk.

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2021 X5 xDrive40i
2015 X5 xDrive35i MSport
(Traded) 2013 X5 xDrive35i