Join the club!
I went through 3 copies of Shaun from my local best buy, and they all freaked out at just past the 90 min mark, on 3 different 3rd gen players. After the third, I finally swapped it for a different title. Incidentally, this is the only title I've had issues with, and NO, it's not a combo and cleaning doesn't help.
After some research, it seems many have had issues with the later pressings of this title on the 3rd gen machines, but reported perfect playability on 2nd gen or xbox drives. The earlier pressings are said to be better.
Just this morning, I ordered a copy of Shaun from Amazon (now $9.95), so I hope I get a playable one, this time.