https://www.chess.com/game/148407129910
This game was showing me that my opponent's timer was still going down until 0. I was shocked when I refreshed the page to find that he had actually made a move and my timer was actually the one that ran down to 0.
That indicates you were disconnected.
The following articles give information to minimize connection related issues.
https://support.chess.com/en/articles/8652402-how-can-i-optimize-my-online-chess-performance
https://support.chess.com/en/articles/8584209-how-do-i-fix-my-disconnect-lag-issues
https://www.chess.com/game/148407129910
This game was showing me that my opponent's timer was still going down until 0. I was shocked when I refreshed the page to find that he had actually made a move and my timer was actually the one that ran down to 0.