Did also try a Sony brand CD cleaner which is clean only used it once or twice on the Bose stereo in the house and it ejects that also but when put in the multi-changer 4 disc player it worked..
But the nav disc slot plays all the music CDs that ive tried fine (all genuine not burned discs), as has been suggested possibly the laser is on its way out but why would it play the music discs
..
Have read on some other threads that if the radio is cold the nav wouldn't work and would work when warm.. And I tried it today in the evening fairly cold and damp but its doubtful this is causing it not to work
I'm not too fussed its just annoying.. If its there it should work that's how I look at these things but they rarely do work that is