Aim help???

ok my aim window that has all my buddies on it, like closes every few minutes and a pop up window that says "srry an error has occoured in aim express the server has become unavailable or or u have lost u network connection. trying to reconnect" then i hit ok and everything goes back, but i have been 1drin why that happens... i changed isp providers from netscape dialup to embarq high speed(dsl) and idk whats wrong..maybe sum1 is trying to im me and it wont show up... idk ....... help