I was wondering if something besides our intense FL heat could be the culprit. Does everyone drive with their top up & windows down? I have a lot of friends with roadsters here & every single one that has rear window issues does that. I don't roll my windows down with the top up, but if I have to roll the window down I notice a LOT of rear window vibration. Could this be an issue across the board? My parents always told me not to drive top up - windows down in a roadster for this reason & I trusted them because they know cars. Is this a wives tale or maybe something???