Keep getting disconnected in game

Hello everyone, I have a big issue in-game, I keep getting disconnected and reconnected (like every ~15-20 seconds) without me doing anything particular, I don't suffer any lag and my ping is around 55 ms. My Internet is fine, I launch LoL as administrator, and I saw on some post to disable Ipv6 but it already was. Any idea what to do to fix this ? Thank you
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