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I have this problem as well. I took it to the dealer today. They spent the whole day trying to find what causes the noise. A couple of thougths are going around. Please report this with your dealer.
I will report back if a fix is in place. Btw which model do you have? I have the passion.
Mine is on the A-pillar above the door right above my left ear. Smart said this should not be occuring. One possible cause is the glue holding the insulation did not stick to the A Pillar of the Trident Cell and is scratching during a vibration period while during over 40 mph.