My Touch had always a very unstable USB connection to my XP laptop. I had for instance to load every FW update by Wifi or by sideloading it, because the USB connection always broke when I tried to update via the desktop. Even sideloading was sometimes difficult or even impossible (then I had to use my Windows 7 net book).
I get always problems if I try to copy a huge file or a rather huge amount of files in one go to the Touch.
Somebody on this forum recommended to change the USB connection from speed to reliability.
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