IPhone randomly cannot be detected by iTunes over USB docking / hub connect

Hi,
I got one XP laptop and one iphone 3GS, but somehow the synch process can only work in random times ?
my iPod is connected through USB docking station it works but when I disconnect it and reconnect it again it doesn't ?
any idea of what might happens ?
Thanks,

Is your computer usb port usb 2 ? it should work directly connected (no hub).

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