Sounds like a cover off and a light blow out with an air duster.
Make sure it's disconnect from the power remove the outer cover if possible and gently blow out any excess dust and debris.
Belts, motors and shafts can clog up or get dry causing jittering stalling etc Make sure everything that moves is clean and if required lubricated with an appropriate oil.
Had to do this with several CD players over the years and 9/10 times it works
Any other symptoms? Juddery drawer? Not reading discs? Skipping during playing? If the above clean out doesn’t improve things, you may need a new laser and/or tray mechanism.