I have been playing and in the past 2 hours it has froze 7 times. Whenever a big linchin dies or something it freezes up or in arenas it will freeze up. Not sure what is wrong or what to do?

When I say freeze I would like to clarify that I can still run around but nothing works or happens other than me running around a frozen screen.

Computer is up to date, drivers up to date, recently downloaded most up to date java. Computer far exceeds minimum requirements for game. What can I do to fix this issue because playing is becoming annoying.