LoL crashing frequently?

So recently my game has been freezing up a lot. I don't know why it happens but this is how it goes, my game freezes but my laptop is working fine. I can tab out of the game to open task manager to close the game but it won't close. So what I have to do is restart my laptop, open league and rejoin the game. This process doesn't take much because I have a fast laptop but sometimes my teammates vote to surrender and they all report me for leaving. It happened to me a few times already so now I am scared to play the game in case I get banned... Does anyone have a suggestion on what I should do?
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