chess.com clocks malfunctioning -

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Avatar of WIKIPAWN
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Avatar of Martin_Stahl

https://support.chess.com/customer/portal/articles/1444849

Lag correction is the most like reason.

Avatar of WIKIPAWN
[COMMENT DELETED]
Avatar of Martin_Stahl

You could also not actually be connected and the client side isn't registering that fact. I've had a couple of games (I only play limited Live) where my opponent's clock was still going down but my client had a glitch and hadn't updated the position where it was actually my move.

I now have the habit of force refreshing the client if it looks like that might be occurring.