New patch 8.5 HELP ME!!!

Hi, I'm having serious problems with this patch. Every time I start a new game, the pc just crash and goes down and i can't reconnect to the game because it's always happening even when I reconnect. The screen just stops and then the pc powers off alone but it is just when I play league, if I go and play some paladins or cs go it is ok. I'm playing league for like almost a year and it never happened. I don't know if it is my pc that don't want me to play league anymore or if there is some solution. My life without league is just boring as %%%%. and I can't afford a new pc right now, so please, help me!!!!!!
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