Lag spikes going up to 3000 at moments...

Hey everybody, I've been having some really strange and unusual lag spikes for the past 4-5 days while playing league that sometimes peak at 3.5k ping. I really can't see why as I've got any running apps on the background off and i've also disabled any windows updates. Any suggestions, I've seen the option called Quality of Service for a router but I really don;t know how to do that? Thanks
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