Same story here. I was about to win with queen and king vs king and rook, but I disconnected with 3 min 30 sec left. I reconnected 3 min later and took his rook, but my computer was lagging and I couldn't make THE LAST MOVE TO CHECKMATE!!!! Ended in a draw. 
Disconnecting
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Why do I continually get disconnected? It always happens like 25 minute into the game at a critical juncture. Meanwhile, I have other open windows that are interacting just fine with the internet. Very frustrating!