I would agree that it is unlikely to be a software problem. I do have a similar issue when I plug my KA1 into a USB 3 port on my laptop. The USB 2 port works as does a USB 2 hub plugged into the USB 3 port. Another possibility is the USB connecting cable. I've found multiple devices that are not happy with some of my collection of USB cables (device A works with cables B, D and E, device B works with cables A, C and E and device C works with cable B, C and D).
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