start itunes, go to "Edit" -> "Preferences" shwitch to the "Devices" tab. and toggle "check on and off" the disable automatic syncing feature, this should fix the problem.
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but normally it would be enough to change the settings from automatic to manual on the "top page" for the iPod - i always use the manual sync on my iPods - the method above is more for the people who were plagued by a fast "3 second sync"
i've read a few things. maybe this would help:
start itunes, go to "Edit" -> "Preferences" shwitch to the "Devices" tab. and toggle "check on and off" the disable automatic syncing feature, this should fix the problem.