The mirrors can be coded in BimmerCode to fold on lock. Even when stuff powers off on the door open, which I also have mine do, I don't think it's the same as when it powers down when it locks. Did you try charging the battery yourself to see if it just needed charged? You could replace the battery yourself if it comes to that, then use the BimmerLink app to register it (necessary to make it work and charge properly).
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