SharpCap should be an interesting test as it uses the ZWO SDK API calls rather than relying on ASCOM. If you connect it up and run it at, say, 15 second exposures, you should get a constant stream of images out of that too.
I’m just trying to think along troubleshooting lines...there must be something awry somewhere (and I’m not ruling out the camera itself), but I’ve found USB 3 itself to be very picky, not specifically with my ZWO cameras (I have 3, but with hard disks, etc too.
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