league of legengs Glichting out ingame

ok so the past days i played snowball urf event thing and when i typed ingame somthing sens im having fun i like to make smilies and i miss click my keybord and end up making a Æ: and my game stops responding its running just fine but not updating the infomasion desplayed on my screen i minimized it just fine and open it and i can hear it running just fine when my screen comes to it it its still frozen but i get like 0,5 sec worth of gameplay befor it frezes and it happend 6 times now and it getting really annying :( and no i have nothing else running but lol and media player so and i reinstalled my pc not to long ago so dont see how it can keep happening [sg-soraka]