There are random games where the screen would become very pixelated and buggy. It is still playable but makes it very hard to see during teamfights. Anyone else have this problem?
Its possible its overheating and causing graphical glitches. You could try a SMC reset and see if that helps.
© 2014 Riot Games, Inc. All rights reserved. Riot Games, League of Legends and PvP.net are trademarks, services marks, or registered trademarks of Riot Games, Inc.