dced mid way game and its not in history

First of all, idk if this is the correct forum/place, so sorry if it's not. I was playing a game with tristana with my friend, i was doing around 9/0 until 30th minute, then both, me and my friend lagged at the same time, thought it was rather strange. since then game was kinda laggy and around 10 minutes later we have both dced. the game isn't even on my history or anything. what's up with that?
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