When on your computer screen, the time of your opponent is on zero, this can mean two possible things:
a) The time of your opponent is really zero (on the chess.com server), and he loses on time.
b) Your computer may have lost connection with the chess.com server for some seconds (or longer?), so while the opponent already has made his move (and your clock is ticking on the chess.com server), your computer has not yet received the signal about your opponent's move (so on your screen, it seems that your opponent's clock is ticking down (your computer just keeps that clock ticking down until it gets a new signal). If you wait long enough until your computer's connection with the chess.com server is working again, the clocks are corrected, and you see the opponent's last move and the real updated clock times from the chess.com server.)
So one possible scenario for what you observed was:
You made a move, and then you saw the opponent's clock ticking.
Your computer lost connection to the chess.com live chess server for some seconds (or longer?).
Therefore, you did not see the next move of your opponent on your screen; instead your computer just ticked down your opponent's clock, waiting for the next signal.
But your computer did not receive the next signal until the game was finished on the chess.com server. Maybe it showed the last move of the opponent and a loss for you? Maybe a loss for you, saying that you lost on time? Or maybe it showed a loss for you, saying that you lost because you left the game? These could be possible outcomes for this kind of scenario.
What do you think, do your observations match this kind of scenario, could that have been what happened?
vonkenboertje? What happened?