Game Crashing at 15 minutes every game

just updated this patch, didn't have this problem last patch, but now every game, around 15 minutes my screen freezes and doesn't unfreeze i can hear the music but can't do anything, i can't even alt+tab out of the game. i have to restart the entire computer. my fps is at 120 most of the game and my ms is 49-50. restarting my computer always ends in my team surrendering or losing. i've found many post with the similar issue, but no solution yet. what do i do? i don't exaclty want to wait for the next patch to see if it fixes itself, because i want to get the prestige qiyana, but i can't play like this.
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