There is a micro-switch inside the place where the top latch hooks into the center of the windshield frame. Poor contact with that switch can cause the windows to drop, as if the top was about to be lowered.
Check these out:
http://986forum.com/forums/boxster-general-discussions/62410-top-latch-micro-switch.html
https://www.renntech.org/forums/topic/10458-windshield-microswitch/
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I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.
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