I had it happen once during a game too. Seems like a bug, I was able to rejoin and continue the game but I lost like 2 mins from it.
I doubt its an opponent hacking or anything, but I guess the possibility is there.
Disconnection problems
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For some reason I was playing a match and I kept on disconnecting, like 5 times. I thought it was a hacker and I changed my password but same problem. It said like “disconnected due to login on different browser or device”.