Passenger window 'twitching' up and down
 

My 1998 2.5 Boxster has developed an issue whereby when the passenger side window is fully up or near the top of the window frame, is starts 'twitch' up and down only slightly (maybe a few mm) but very quickly and repetitively until it drains the battery.

The only way I can seem to stop this from happening is to put the window down a bit which means I can't leave the window up when out, parked, or in the garage. Does anyone know what might be causing this and if so, what I need to do to stop it? I imagine it might be a faulty switch somewhere. The windows also do not drop anymore when the roof latch is released.

Thanks in advance for any help.

On boxa.net there was mention of on page 29 owner's manual instructions on how to reset the window settings. Tried those?

Read through this thread...
https://986forum.com/forums/boxster-general-discussions/87381-possessed-door-latch-01-box-s-rt-side.html
... might help.

That is your door latch microswitch (although possibly the door handle switches as well). Basically, when you open the door, there is a switch on each handle (interior and exterior). This tells the window to roll down a smidge. It stays down until the microswitch in the door latch tells it the door is closed. This allows your door to close without the window smashing the frame.

What has happened is one of the microswitches is worn, and it is bouncing "open"/closed, causing this.

Do you have a floppy door handle? If you open the door, and leave it open does the window stay down?

I'd be inclined to suspect door latch - they are a common failure point.