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Last time I had this sort of issue it was traced back to a vibration from the wiper blades on the windscreen at speed.
Maybe change the blades or tape them down as an experiment?
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Madgambler
325i (E30) => Alpina B3.33 (E46) => Alpina B3s (E46) => 130i M Sport (E87) => Cayman S (987c) => Carrera S (997) => M135i (F21)
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