Could be your ping to the server.
time jumps

It's most likely caused by lag. Can you read the following two FAQs and let me know if they help?
Lag: http://support.chess.com/Knowledgebase/Article/View/91/0/why-did-the-clock-times-suddenly-change-the-clocks-seem-broken
Suggestions for disconnects but that work for lag as well: http://support.chess.com/Knowledgebase/Article/View/167/0/my-internet-connection-is-fine---why-am-i-getting-disconnects
Just playing 1 min Chess and my sone who was watching noticed that the time jumped and so my opponent got an increase in time.
How can this be resolved as i'm losing games that i should be winning