Ipod software update problem


I just plugged my ipod in and got the new software available (1.4) update your ipod blarblarblar thing so I hit ok. The ipod got a little status bar on the screen which after about 2min was completed the ipod then reset itself and then I got the original message about updating again. This has happened about 5times, I updated 5times. Do I just unplug it or is this supposed to happen?