What browser and operating system were you using? Has this happened to you before? Do you use premoves?
chess clocks on chess.com

No this is the first time. When I looked at the game on his profile, I realised that he must have thought that I had given up. He played b3 and I played B d7. My move, however, is not registered on his record of the game. Operating system? If you give me examples I might be able to answer. I am 50 years old! Premoves - also don't know what that is!

Yes. I think this was a one-off that went wrong unless you have received other complaints. Thanks for your supoort.

If you notice it happens again you might try using a different browser. Typically we suggest using Google Chrome or Firefox instead of Internet Explorer. Here is a link to the Chrome homepage :)
https://www.google.com/intl/en/chrome/browser/
I played in a 10/0 tournament. In game three, after winning the first two I played against this dude juancmh from I believe mexico. After move 15 he stopped playing but guess what hiss clock ran out of time but the game win was given to him. Suddenly I was thrown out of the tournament ass well. How can you lose on time if it is not your move????