Macbook keeps freezing during gaming?

[FlubberDucky5]

Hey i have a macbook pro 13 inch 2011 and it can game fairly decently so dont tell me that i need a new computer or anything cause i just play small games. Well ive had this problem for about a year now and it is that when playing games ESPECIALLY minecraft, it just freezes and there is no response whatsoever. I cant force quit or anything either, i have to do a force restart on the thing so that it can work again. It happens all the time that i play minecraft (but i play in fullscreen) and any other fullscreen games. Like yesterday it happened with castle crashers. I dont know what the problem is. Minecraft literally just freezes and the whole computer becomes unresponsive and i have to force a restart on it. This gets extremely annoying and i hate it, all i want is for it to stop doing this. Can anyone help me or tell me what is happening? Any help is appreciated! Thanks!