Couple of reason can cause your Xbox 360 to freeze.
Overheating
Disc Error
Incomplete Updates
Full cache

The most common reason would be Overheating.
To fix Overheating issue, the Repair Guide does an excellent job in showing you step by step on applying thermal compound on your GPU/CPU, as well as modifying your X-clamps to support the heatsink better.
But before you get the Repair Guide, you should always have a habit of keeping your game disc in a case placed in a clean environment.
Perform regular updates on your Xbox 360 as well, as this will ensure that your Xbox 360 is ready to play any sort of games that are being released.
Flushing cache memory is explained in the Xbox 360 Repair Guide as well. Simple steps in the Guide will ensure that your Xbox 360 would not freeze again.
It means that your screen freezes or locks up during game play. You might see your screen showing distorted graphics, fuzzy or even blank.
In some cases, the sound might freeze as well.
Gamers have reported that this does not happen specifically to any game, and any sort of scenario can cause this issue.

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