AutoPunting comes from many problems, some of which include the person's connection type - if he's on a phone modem, it could be problems with a noisey line or the modem or even the isp.
Are you running a firewall? This can sometimes cause problems also, you might try lowering your settings or turn it off to see if this helps. Routers can also sometimes cause problems for some people.
Stevie? You got any other ideas?
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