Lol slows down my internet even after I quit the client

Hi, thanks for reading, After my client starts running my internet slows down considerably even after I quit the client and only a router restart solves the problem. My GPU/CPU are working normally so it's not those. I tried a variety of browsers and websites. My problem is recursive, but not after every game. I got 3 of these slow-downs out of the 4 games I played on this fresh install. After I restart my router everything falls back to normal. Maybe it's the router? I'm using an ethernet cable.
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