This has happened to me, it's not the disc. It's the blue ray laser within the 60gb. I had to exchnage me ps3 with sony because of the same problem you're having except in my case all my games started to freeze not just mgs4, where i got a new 60gb. Anyways after hooking all the wires back up with the new ps3, my ps3 still didn't work so im waiting for sony to send me the box again in order to start it all over again.
I think it's because they probably improved the blue ray laser within the year or so since the 60gb was the only model available, therefore creating problems in the older models. I would call sony if the problem gets worse, they will tell u to delete everything on your harddrive and if it still doesn't work then they will exchange it with you.
PS. The whole process took 2days. From the day i received the box and mailed it back to them and then shipped back to me, good luck with your situation.
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