Just start up a ping test when you first get on... leave it running in the background.
if you dont know how to start a ping test its Start -> Run -> type CMD hit enter and it will bring up command line.... here type ping 4.2.2.2 -t
Just let it run while you play then when you get disconnected check your ping stats. If its still going fine then its not your int connection. If its missed 4-10 in a row... thats long enough to boot ya.