It is possible you got disconnected. You can try a few things. Make sure you have the newest version of your browser, clear your cache, and disable Flash for the site.
You might also look through the following: https://support.chess.com/customer/en/portal/articles/1444918-my-internet-connection-is-fine---why-am-i-getting-disconnects-
The servers have no idea why you were disconnected. If you do not reconnect in time, it considers it an abandoned game
Today i play with guy and in one second it shows me no connection and i lose by timeout. But my Wi-fFi works and i even turn mobile to 3G network. But can do nothing. I think it is cheaters trick. Smbody knows what to do in this case?