Computer crashes A LOT

I'm not sure why, but recently my computer has been crashing a lot when I attempt to play. It usually happens right as everyone spawns in, and well I'm always written off as a "leaver". It's getting really frustrating, because now I'm in lower queue and I'm trying to get those pushed out. My computer has been reset, and I have downloaded league again. I played one game and it seemed fine but in the next game it crashed. I'm pretty bummed out about it to be honest. Does anyone have any suggestions? Also please don't ban me rito I'm not leaving these games on purpose ;-;
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