My Xbox 360pro freeze when I play it.?

I got it for xmas and the first game i played was laft 4 dead after an hour it froze.So turn it off and put naruto in and after 15 min it froze.So i let bro play his MCvsDC and he played for 20 min it freeze.At first I tought it was the games but i went over my friend house and played them all day for about 19hours and they didn't freeze not once. What should I do? My dad said that we can send it back for the warrnty but I don't want to wait. (It not the ring of death)