My O/E electric tilt & slide sunroof has stopped tilting! It still slides open fully and closes but now needs two button presses to open and two to close. At the first press of the button the sunroof slides back only an inch and stops. Releasing the button and pressing it a second time gets the sunroof fully open. Closing the sunroof now needs a first press of the button to get it 95% closed and a second press to get it fully home. The car is a 1995 2.6 Avant and the sunroof was working perfectly on both tilt and slide until last week. The mechanism has been kept lubricated.

Any suggestions will be much appreciated.