Why did I get leaver AFTER reconnecting to game?

Just wondeirng, so my internet suddenly stopped wroking in the middle of game and I managed to reconnect just a few minutes after and it didn't dc me again, but I still got leaver warning after game, yeah thanks Riot for punishing me over my internet. My internet NEVER acts up, but it just is today so it's unpredictable, wanted to sorta see if it was gonna act up ingame.
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