lost connection to server....

we have a strange problem.
everytime me and my friends start a game we disconnect after a couple of minutes playing and get the message:

"You have lost your connection to the server. Now dropping you to single player mode"

we have all tried to start games from different computers and we all have different internet connections, but we disconnect every time. sometimes after 10mins sometimes after 1 minute.......

please, any ideas?

Do all three of you use dial up?

we all have broadband, 8mbit, 24mbit and one of us has 2mbit.
maybe it has to do with some kind of firewall? but i only have the windows firewall and its turned off...
when you start a server, is it usually stable?

don´t know what caused the problem but we have found a way to be able to play without disconnections.
we dont get problems if we start games using the winbolo game creator!

deal with it :x