shadowlord

Hi all! i noticed that my portable sony mz-r909 takes awfull long to recognise a new inserted disc. jumping from one track to the next takes long to. sometimes it works right and it forwards in ~2 sec. from one track to the next. but most of the time it takes 5 seconds or even longer. i cleaned the lens with a q-tip with a drop of alcohol but it didn't help. any ideas ?