Client Freezes in Game

So ever since I downloaded the recent patch, the game randomly freezes and I can't do anything. I can't even go to my task manager to shut the game down and the worst part is, the game works fine for like the first 5 minutes of the match and then starts freezing up. I've run the corrupt repair program from the login screen, reinstalled league, checked my drivers, cleared my RAM, and turned off my firewall to test, and it still consistently keeps happening. It's really becoming a pain and I don't know what else to do. If someone can help me I'd really appreciate it.
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