This may help,
http://support.chess.com/Knowledgebase/Article/View/167/0/my-internet-connection-is-fine---why-am-i-getting-disconnects
Losing connectivity all the time
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Ok, tnx,
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Hi,
I play 1 min games and losing connectivity very often, resulting in 20-30 sec+ lost time or lost game.
It is very annoying, as it happens almost every second game and I cannot play normal. Other pages work fine in that time. I wonder if somebody else is experiencing this problem, and if there is something it can be done about it.