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Sorry to have to welcome you to this club.
There doesn’t seem to be a right or wrong way in what you do, open/close or how often it is used. Atmospherics and humidity do seem to play a part over time. I was chatting to a family friend who is an experienced auto engineer across many manufacturers, and the first thing he said to me was yes BMs and Audi VW brands it’s a too often occurring issue with pano fabric roof blinds. Unfortunately no easy fix complet roof liner out to remove the whole sunroof assembly to access the cartridge in the rear of the assembly. Cost in the uk using BM dealer is in the region £1150 cheaper than the comparable price in the US. Haven’t decided if I’m going to have mine done just can’t bring myself to spend over 1k on a seven year old motor. Had mine fully open for the last three months during hot weather and not mist it at all. Happy motoring
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