The window drop to 3/4 normally happens when the top is unlatched. There's a microswitch where the latch engages above the windshield.
The window spontaneously lowering all the way sounds like a problem with the central locking system. You may want to remove the box under the seat, open it and see if there is any sign of corrosion. Light corrosion can often be removed with electronics cleaner.
https://986forum.com/forums/performance-technical-chat/62650-need-immobiliser-advice.html
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