Every game when a game is about to end and there isn't less than 15 seconds the timer suddenly changes so that my opponent wins. Even if I see they have less than one second at the last moment they suddenly get a boost of seconds so I time out.
I think it could be lag.
https://support.chess.com/customer/en/portal/articles/1444849-why-did-the-clock-times-suddenly-change-the-clocks-seem-broken-
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Every game when a game is about to end and there isn't less than 15 seconds the timer suddenly changes so that my opponent wins. Even if I see they have less than one second at the last moment they suddenly get a boost of seconds so I time out.