My experience may have relevance to this problem. have a Pi4, a usb3 hub, gps dongle and assorted cameras running from the usb hub When I first connected things I had the usb3 hub connected to the usb3 connector on the Pi4. I could never get a gps fix. Then I read that there can be interference from usb3 signals that can prevent the gps dongle getting a fix. I connected the usb3 hub to the usb2 connector on the Pi4 and everything works like a charm. Whether using usb 2 rather than usb3 slows downloads of frames I have no idea since I have never been able to use usb3.
Mike

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