the pickup may be getting dirty; you can try using a CD laser lens cleaning disc. I have one from Audio Source. It has a tiny brush that rotates to clean the lens.
If you can access the pickup by opening the cover you might try a blast of clean "canned air".
If this doesn't help then the servo needs to see a technician.
If you can access the pickup by opening the cover you might try a blast of clean "canned air".
If this doesn't help then the servo needs to see a technician.