post ejecting ipod trouble

When I eject my iPod (start - computer - right-click iPod drive - eject. Or eject from iTunes if opened), Vista attempts to reconnect the iPod immediately and without success. When I open "computer" file to view available drives, I can then see my iPod bounce between "Devices with Removable storage" & "Media Players" listings... what gives?
Temp solution is to physicaly unplug the usb drive from the computer... just unplugging the iPod from the cable isn't enough, you have to remove the USB from the computer.
Any suggestions or know of an update?