Could you try testing the disc in another console, or try installing another disc on your console just to make sure your console is not the issue?
This most likely sounds like a disc issue but it may be caused by something else.
Another thing is you can try booting your console in safe mode and try Restore File System and Rebuild Database. For more info on how to boot your PS3 in safe mode check out Sony's support site here:
https://support.us.playstation.com/a...fe-mode-on-ps3