My mirror had this issue with a flapping body in the wind at speed and bad mechanism. The flapping body was caused by broken plastic tabs where it attaches to the metal mirror body and the poor movement was because the mechanism uses plastic gears and teeth can snap.
I rectified mine by replacing the mirror with a part from a scrap yard. Colour doesn't matter as you can swap your coloured backing onto the newer one.
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Phase 2 1.9tdi V40
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