Try clearing the cache in your browser. Chess.com is very sensitive to how much memory is available since it's browser based. No guarantees of course, but it's the first thing to try when things get strange.
What's going wrong wth the net game play?
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i am also experiencing the same problems as james99
My moves won't take hold, players vanish and the game locks up. I have lost a nmber of games today over this glitch. Is the problem with your web site or my computer system.