It also froze your Xbox 360 every time you tried to play Crackdown 2. After about twenty seconds on the loading screen, everything freezes. Hard. So hard you have to press the power button. Naturally, you figure this is a problem with your Xbox 360, as has so often been the case in the past. So you uninstall and reinstall various things and you frett that maybe your drive is eating games again (I've most recently had problems with my Xbox 360's drive damaging disks, and I've lost about $200 in games that Microsoft's customer support has refused to replace).
Eventually, you wonder if maybe it's just the Crackdown 2 DLC. So you Google it. Yep. Sure enough, the DLC freezes up otherwise well-behaved Xbox 360s. LINK