Junkycosmos, I had the exact sale issues. I thought the rubber seal around the window perimeter was too old, but after putting two small electric strips on the ledge, where the square guide rides over, it stopped all glass rattling and no more sounds

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I swear, my cars are like a girlfriend.
Sometimes its a rough ride, sometimes its smooth motorin'.
Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
BUT at the end of the day, she loves it when I am inside her.

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'91 850i
'05 X5 4.4i
'09 Clubman S