Hi guys got a slim DG-16D4S which will only read games intermittently, the laser comes across and sometimes wont read the outside edge of the game and wont start up, if you put the laser in the middle of the disc and then start up, it will play the game ok, i have changed the laser twice and tested the other 2 motors and they seem fine, have also changed the plastic white arm, do you think this could be a board fault, thanks.