When I connect.. sometimes it says Device not recognized or malfunctioned!

Hi. When I connect my ipod to any microsoft device, sometimes my ipod doesnt connect. I cant charge it, or restore it as it behaves like a useless piece of plastic.. I get a yellow bubble 'Device not recognized or has malfunctioned'
This problem is bizarre! I cannot find anyone who actually has a solution for this problem! Apples standard answer is for me to reinstall my drivers or update itunes or windows. Done it. No solution yet.
My ipod works fine.... sometimes. Its a completely unpredictable problem. Ive googled this problem and so many ipod classic owners have asked.. solutions ive tried: the 5r's, updating drivers, It managed to connect once, but now it wont. My ipod normally works fine on my PC, XBOX, laptop and Mac.. but sometimes, unpredictably, it wont be recognized by anything apart from the mac. For a month it would not connect at all and I took it in to an Apple store where they told me it works fine. Its not my PC.. its up to date, and theres no reason why it doesnt work on my XBOX because some times it does.. last night it did, today its broken again, I suspect tomorrow it may work. This is SO frustrating!!
I have alot of experience in PC's and normally I can solve a problem by process of elimination, updating and reinstalling, but in this case.. everything seems fine. My only idea is that maybe its my Sync cable?? Which also makes no sense because it generally connects fine on the mac - and, why would a sync cable be unpredictable.. surely it either works or it doesnt. HELP PLEASE!!
Nick.
my email is: [email protected]
my serial for my 80g classic is 8K819CPKYMV and is under warranty until May 2009, i bought it in August this year.

there is a good chance that this can be related to bad contact in USB lead.. e.g not enough power from IPOD to PC so that pc cannot recognise it. Where I work I get alot of USB devices on pc's that are not recognised and most of the time it is the connection to the device that is not good enough because the flat end of the USB adapter has been gradually bent over time just slightly and now contact is not good. It can also be todo with drivers or If you are using it through a USB hub.
so if it is not working through USB hub try direct. also try in back of PC as these Ports or direct access to main board to pc and would be less trouble some if there was a voltage loss from mainboard in pc to front of unit.

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