Way to keep a game from unfreezing?

I bought a copy of Yu-gi-oh! World Championship 2010 Reverse of Arcadia a while back. I managed to find some cheat codes but they were for the Japanese version everyone on the forums said they would work fine on the American version and they did. I would also like to add before anyone criticizes me for this that I had beaten the game already and wanted to play through making it more like me if I were in the game. I used the Unlock all cards, Unlock all duel disks, Unlock all outfits, and Unlock all Duel Runner Parts. I did use one that had a warning of freezing (It was to unlock all the duel opponents in world championship mode). I dueled some glitched characters with my deck name and it froze. Now it's freezing during any duels I have or even just in duel calculator mode. I tried erasing my old game and starting new but my first duel begins freezing again. Anyway to get this to stop or do I have to get a new copy of the game? Any info will help (aside from telling me not to use codes.This is Yahoo answers after all not Yahoo "tell someone how to game").