I would firstly suspect the powered hub! I had similar issues with 3 ZWO camera on a M-beat powered hub. I eventually swapped over the M-Beat to two high end 5 port powered USB 3.1 hub to power any USB3 ZWO camera and it is much better.
When you plug the camera directly into your PC with the supplied cable - and it s detected - can you download any image? If so that points to the USB hub...
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