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This has been an increasingly bad problem for me. I will be in a game after connecting, but then the screen freezes and the client crashes giving me the "Reconnect" option. I dont think this is an internet problem because the same problem occurs on different wifi networks regardless of how strong or reliable they are. And the disconnect only seems to happen when I move my champion or action takes place on my screen.
My settings are turned to the lowest setting as well.
I'm also greeted by a mac error window telling me "League of Legends unexpectedly quit"
It also provides a MASSIVE log of the problem, but I am hesitant to post it since it's easily over 5 pages long.