http://blog.chess.com/NimzoRoy/diagnosing-and-fixing-internet-problems
If nothing in the blog helps contact the staff directly via Help & Support at the bottom of the page, and they will want to know what OS and browser you're using, without knowing this it's hard to give "any tips to help"
When ever I play, it seems that my opponent't time is finished while I have enough time left. Once the opponent's time becomes zero, it restarts after a while. It happens few times, them my time becomes zero and I lose on time!!!!!!!! What is wrong with this site?
Any tips to help??