Any help with LoL crashing my entire pc?

I run the game on low quality, it runs on 122+ frames, but it randomly crashes the entire computer. Does anyone else share this problem? Does anyone know how to fix this problem? I tried the full repair and that didn't help, the only tell-tale signs of a crash are random frame drops, which out of the several crashes in the past few days has only happened twice. Please help, I don't want to get banned for leaving the game or AFK behaviour.