Board frozen

I was just about to win, when the board became unresponsive. I still had a solid WiFi connection, and could chat to my opponent about it: but clicking on pieces got no response. I tried backing out of the game and back in by various routes, for 10 minutes as my click ticked down. Then accepted a draw instead of a loss on time.
Please check what went wrong so I could not move.
Screen shots are available

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