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I've read up a lot on my X1 s28i, and would see quite a few of these blow out for no reason. I also had a camper shell with dark charcoal explode into little squares for no reason. I'd guess the moonroof is brittle. I'd read up on conditions when it happened such as driving with windows down which can really buffet X1. I noticed I hate windows down on my X1 at track day where you have to have them down in case of wreck.
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