Forum:Game isn't playing

ok so i originally bought a used copy of fallout 3 for my xbox 360 online over amazon. got it. it only had one or two very small scratches on it. played it for 3 days, then i woke up on the fourth and it said it couldn't read the disk. cleaned it and everything and it still wouldn't play. so i returned it thinking it was the scratches and bought a new one still in the shrink wrap from amazon (the company, not a user on amazon) and played it for over 2 weeks. did well over half of the game, and then restarted it again because there was alot i wished i did differently. i woke up friday morning and was going to play and it said it was unable to read the disk. i cleaned it and tried a couple more times. it ether said unable to read disk, mixed media disk, or simply open tray. i cleaned it much better, i cleared the cache, i even put in 5 games first, and still the same thing. it isn't the xbox 360. it's under a year old and every other game i own plays perfectly and been watching library rented movies on it and you know those have a ton of scratches on them. i really think it is a problem with the game since this has happened twice with two different disks. and doubt you need this info, but i will say it none the less. the used copy was just fallout 3, and the new copy is platinum hits. i also have all the DLC.