Anyone's having problems with games that reset themselves?

First of all, i have a "made in japan" dreamcast. I have burned quake 3 arena and nfl 2k1 fine. When i play the games, the game or my dreamcast resets and goes to the win ce screen. My friend's "made in the USA" dreamcast plays the same games fine. It doesnt reset. Anyone know how to fix this? Please help.....