I was going to test some things this evening but after a test drive this afternoon where I experienced serious vibrations over 100km/h I decided to stop the search and just take it to the dealer.
On the way there the passenger windscreen broke on its own (I don't see any impacts on the glass nor did I hear anything). Also on the way there (100km of driving), I didn't hear the sound once.... really strange. It was 7°c outside this evening, so maybe it is a temperature related thing.

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Lets hope they get it sorted quickly as I have an event to attend on april 6th, I have sent the dealer a mail to check the bevel box outer flange for loose bolts. I'll keep you guys posted and really appreciate the help and ideas

I'll drive.