When switching on the unit and loading a cd it can

when switching on the unit and loading a cd it can take a long while to register the cd then it will play for a few seconds then stop. this will clear after a few minutes and play as normal, however if i switch the unit on and dont put a cd in for 10 minutes or so the cd will load and play instantly with no problems.is this a common issue with the cdj 800 mk2? does anyone have any ideas