Sorry to hear about your problems John, but thanks for sharing. I used to run all my USB peripherals through a single USB hub and had quite a bit of QHY9 trouble earlier this year. I now power the CCD solely from a 35AH battery and run it through a separate USB connection, so far with great success. Power supply used to be a double insulated type.
Will be interesting to hear how the USB isolation works for you.
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