Linn Karik's CD drawer cannot be closed

I bought my beloved Linn Karik 19 years ago. It was a high end product back then and it still is...as a transport.
Lately it has an intermittent issue with the drawer that cannot be closed.
I opened the CD case and put a tiny amount of lube on the (too dry) thread that controls the vertical movement of the photocell and indeed the door would open and close and the vertical movement which used to be noisy is now quieter.
A day later...the problem is back : The tray would not close.
Anybody had such an experience ?