I've had a similar issue on my 2018 roadster. If the window is fully up (with or without the top down), I get an annoying rattle (sounds like metal on glass, maybe) coming from the drivers window. If I lower the window even half an inch, the noise stops. The weird thing is the top of the window isn't touching anything when the convertible top is down, so the point of contact has got to be in the door. I'm thinking the window regulator theory could be the correct one.
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