Heads up l took the dock back explaining about cable problem, they gave me 2m usb 3 cable from a diff company which is 1m longer, hooked it up pushed cable all the way in and bang worked straight away and has not dropped out, so it seems the cable that comes with NexStar docks are faulty, so l suggest to all if u hv these docks also get a usb 3 cable made by someone else and try it, l would say everyone's prob with drop outs would be the cable that come in the docks box.