I had that, It was more of a rubber on rubber sound. I took it to Porsche and they discovered it was coming from the door. The took the whole think apart and "fixed" it. They said that they did not find anything loose, but made sure everything was tight. Thanks warranty! It has not happened since. Also check your windstops, make sure the mesh part has enough padding between the clips and the rollhoops, it might be that. Hope this helps.
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