My XBox 360 keeps freezing, idk what ta do help please?

Ya so im playing good game of Association in NBA 2k10, im the celts up by 10, on a big run and i pause the game and then i try to go back in and it just freezes. Now i turn on the xbox again and go into the association game and in the 3rd quarter again against the bobcats it freezing when i pause it. Someone said i should try saving the game to my hard drive but in the middle of doing that it freezes. Alright then i try it again today and it freezes on the dashboard after 20 minutes. I have xbox live idk if that has anything to do with it, then i unplugged the xboxlive and it still froze. Idk is it overheating theres no red ring or anything just freezes it annoying. help!