League crashes and freezes laptop

Hello Recently had issue with league giving out bugsplat and freezing computer, first thought it was my pc faulty, but cleaned it from inside and did a factory reset, it runs smooth but still crashed after whole day of playing yesterday and today i get same thing but even when i connect back i play for 5minutes and it's the same again. Plus can't see mastery points on myself and some other players. Hope someone knows whats the issue.

Thanks.