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If door seals , just lowering the windows a couple of millimetres will confirm if it's these. Had this issue on my e39 and f10 and as soon I as got my g30 I proactively applied gummifledge to the door seals although I had never actually encountered the issue and 3 years later still not seen
If turns out to be that ensure you don't wax the paintwork where it meets the rubber and have heard the use of silicon is not a good idea as issue can reoccur again
As others said it might be the sunroof though
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