League crashes the whole system

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Every now and then the whole game freezes (even the sound doest that weird frozen sound) and the only option is to hard reset the whole pc. It either does it every game for a few days or it doesn't happen for like a week. Can't tell any cause for this, seems to be pretty random. Doubt it's hardware related as no other game does this. I've linked the dxdiag and last game log where it happend. Any help is appreciated.
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