League of Legends causes HUGE Packet losses

When I started playing a game with my friends I experienced HUGE lag spikes. After typing "ping -t www.google.com" on the cmd I noticed that whenever I had lag spikes my connection would time out and then come back. When the game finished I pinged www.google.com again on cmd without any packet losses in about 10 minutes. Any thoughts what caused it? And most importantly how to fix it?
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