Random lag spikes, like freezes but internet connection

Well basically, at a random time my League just started having random lag spikes where I lose control of the character for a few seconds and then the game resumes fine. Let me clear a few things first; first I can not simply just get an Ethernet cable so nobody suggest that please, 2nd I DON'T have this problem on other games such as CS:GO or WoW. Lastly I don't believe its the PC itself because I've completely wiped it to fix this and then updated all the drivers. Is anybody able to help me solve this problem? Link to graph : https://postimg.org/image/3qg4k82tn/
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