Time

Twice today I have been playing 5-0. During the game I make my move and my opponents clock starts and my move appears on the score. Then about 20 seconds later my clock starts again, my opponent has not made a move and my last move is showing on the board. I have about 90 seconds left so I wait. When my clock reaches 0.00 I lose on time and the msg 'Your last move xxx did not reach the server in time' appears.  I have not had a disconnection and  the site shows that I have very little lag. I have been playing here for a long time and this has never happened before. Any ideas whats going on?

lag...disconnection...no one ever thinks its their connection.

You might take a look at the following two things:

https://www.chess.com/blog/News/how-to-adjust-your-live-chess-connection

https://support.chess.com/customer/en/portal/articles/1444918-my-internet-connection-is-fine---why-am-i-getting-disconnects-