My guess (based on nothing!) is that with a broken tooth the system is uncertain of its position and so tries to re-set it to the correct position for the system state when, for instance, opening the door, switching on MMI etc.
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2002 D2 S8 – Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18” Avus, ski hatch, Bose, auto dim rear view mirror, rear blind.
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