Disconnected for no reason.

I was in a game of ranked solo and my team was very far ahead in the game and it was clear to see we were going to win, out of nowhere as I was clearing a jungle camp and I disconnected and died. I closed my league client and opened it back up and It said I could not log in because of an unknown issue, it would not let me log in until 45 mins later and it turns out we lost the game. I checked my internet, my phone, xbox and moms laptop were connected to the internet and working just fine so it was not an issue on my end. if the game continued, it was not a server error so Im so confused as to what happened and how it did? I dont think I lost any LP for it but I dont think it was fair to my teammates that we lost the game because I disconnected. I am assuming it was a bug.