A little update on this one... think I found out what the problem is.
The problem may be that one of the heads dont come close enough to the disk, because by accident I tried to turn the drive upside down and insert a disk with the cover off, the drive starts reading the disks again!
So I tried to apply a little pressure on the "cradle" the disk is in and it reads disks now every time. Now I need to find out how to adjust the heads just a little bit so I won't need to apply pressure all the time....
