Very strange and frustrating behaviour there Ken, Dumb question: have you tried using a different USB port on the laptop? Not all are likely USB3 but usually two will be and the rest USB2, but anyway it might be power related on the USB bus and worth trying to be certain at zero extra cost.
Another dumb question, what about the camera end? Can you use a power pack with it or maybe a second usb cable plugged into a usb power hub? Might be the camera end thats struggling which should be considered.
Good luck with it mate.
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