oops game crashed (mac OS X 10.10.5: persistent)

Ever since the new update I have been experiencing game crashes. I was able to play a few games of AR urf, until my game crashed suddenly and didn't go into the loading screen for the game. I checked my internet connection and it was perfectly normal, so i tried to reload into the game. After about 30 seconds of attempting to load into the game, the league window minimized and said that the game crashed and said to try to reload into the game. I wasn't able to reload into the game, so I kept the minced window up and decided to watch some YouTube videos and do some homework. After 20 minutes or so I heard the soundbite that activates when you load into the end game stats. The page didn't load, but I was redirected to the home page. I then loaded into another game, (or tried to), and the game crashed again in the same way. This time I exited out of League... Exiting out of league made it so I could not open league of legends at all. Clicking the application wouldn't even make the icon bounce at the bottom tool bar of my macbook. Because I couldn't open league, I decided to reinstall it. At first I thought this did the trick, but after a few games played the game crashed again and I can't reopen League. I don't want to reinstall it again (and yes, I did properly uninstall and reinstall league) so I decide to file this report instead. League has run properly before, so I don't know why it has been crashing lately. The only thing that has changed between now and back when the client didn't crash, is that I have downloaded Arduino for programing software for a megaboard. Any advice or information would be extremely helpful. Thank You