This pretty much isolates it to being a USB problem, not a TomTom one. Have you had any difficulties on this computer with other USB devices such as flash drives?
I wouldn't think that using a docking station would cause a problem. It certainly hasn't for me.
Other people have also had USB problems. Not sure why. The TT's are UBS2 devices and sometimes the older USB1 drivers don't work until refreshed. Others have reported success by removing the drivers from device manager and then rebooting so you might want to give that a shot.
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