About twice a game on single player, the game freezes.  The freeze lasts anywhere from 5 seconds to 1-1/2 minutes, after which play resumes where it had left off.  If I minimize the game, it tends to unfreeze within 10 seconds or so (though this could just be coincidence).  I am not certain if the issue affects multiplayer as I have only played one multiplayer game.  On several occasions during tournament mode, the game has frozen while loading maps and not recovered. Otherwise, the game runs smoothly.

My system specs are as follows:

Intel Core 2 quad CPU 2.4 GHz

4 GB installed RAM (windows Vista 32 Bit)

NVIDIA GeForce 8800 GT

Thanks in advance.