My old Core 360(made in 2006) would sometimes randomly stop reading the dvd during the game and would give me an error message and boot me back to the blades menu. It would suck if I hadn't saved in awhile or something like that, but it only happened randomly. I think Blue Dragon caused it to do it the most from what I remember. It would only happen sometimes though like I said.
I later (earlier this year) replaced the 360 with a newer Elite 360 and I haven't had any problems. :)
If you have a hard drive you might want to try installing your game on the hard drive and play it off the hard drive. That should be easier on your drive as you won't need the dvd to spin while playing the game. (Well that is if it still can read the dvd's)
starcraft: "I and every PS3 fanboy alive are waiting for Versus more than FFXIII.
Me since the games were revealed, the fanboys since E3." 
Skeeuk: "playstation 3 is the ultimate in gaming acceleration"
