???? I can only offer what I know, I don't know your player.
it could be that rubber pad is slipping and the player won't read that it has to flip the disc.
or the alignment is off, don't really know how to do that but have had that issue in the past.
don't open that caddy up with the laser, shouldn't be the problem if its working 99% of the time.
I would just see if there is also a screw that is too tight, you may have tightened it too tight or it was like that in the past.
or something that got bent in shipping?? or ????
________________________________
the rein-o official signature: