Could be a dirty lens. Maybe some-one knows a safe way to clean these with slot-loading drives. Better yet ask Apple! Having killed a super disk drive about 8 years ago, I am very cautious about shoving cleaning disks into any sort of drive.
Create a new user account. If you have fast user switching enabled turn it off. Log in as the new user and see if the problem persists. If it does; Did you recently install system updates? If so try reverting to the back-up you hopefully created before doing the updates.
If this resolves things you know it is a software issue. Do updates one at a time until you find the culprit then go back one step.
Otherwise that is what warranties are for.
Create a new user account. If you have fast user switching enabled turn it off. Log in as the new user and see if the problem persists. If it does; Did you recently install system updates? If so try reverting to the back-up you hopefully created before doing the updates.
If this resolves things you know it is a software issue. Do updates one at a time until you find the culprit then go back one step.Otherwise that is what warranties are for.
