have you a lens cleaner?
sorry for the shouting text, I cannot paste links, and when I grab titles, it comes in huge
Arsvita CD Laser Lens Cleaner Disc Cleaning Set for CD/VCD/DVD Player, Safe and Effective
The laser’s do get dirty and/or weak, how consistently does it load/read the disc before you hit play? after you try to clean it and get lucky: weak lasers have trouble reading discs prior to play.