Guys dont even waste your time on searching what the problem might be
It is straight forward simple that the connection between audya and pc via usb is amazingly unstable (note) if you are transferring audio loops eg 3gig worth you need to select 100 loops or less at a time otherwise it will disconnect on you or the best way to do it is pull out the hhd from audya plug direct into pc and that way you can back up or transfer large amounts of data with no fail