When this happens, completely reload your page. You wont leave the game and it will refresh with the current server status.
If you're on mobile... hit the little chessboard icon in the top right corner and then select your current game. It'll resync and you'll have lost some seconds, but be back in the game.
It's definitely a sync problem, that *may* or *may not* be internet related. Who knows for sure without digging into the code and experiencing the problem first hand, but I've definitely been hit with it as well.
It was not a connection issue, nor the site being down, had the time to check both. Never thought of refreshing, which, to be frank, should have been my first reaction.
This makes the bug manageable, since it is quite rare.
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