pbe bug

tbh not sure if this is a bug but chose varus on pbe went into game and load in screens fine but as soon as the actual game starts my entire computer freezes sorta my LoL freezes i can move cursor but i cant ctrl+ esc or choose anther tab i had shut down my computer and tried to open league again 3 times by the fourth i just didnt open league until i thought game was over i tried to wait a minute or so to make sure it was the league game so i ctrl+esc in load in screen waited a bit after game loaded as soon as the game popped up on my screen it froze again but after that first game i tried a second game with varus and the samething happened again