Disk Jumping/Faulty Laser
Basically you start loading the game disk and at some point in the loading process the disk fails to read and skips back to the Dreamcast intro screen, which then struggles to read it for a while before attemping the load again, with exactly the same result.
Is this a common fault in Dreamcasts, because the one I had four or so years ago started doing this and now the one I've only had for a couple of days off Ebay is now doing the same thing. Has anyone else suffered similar woes?