On Nov 19, 2022, at 11:36 AM, Jeff Nonhof KD8THX <kd8thx@...> wrote:

Investigating further discovered that during the RPi reboot process the RPi is waiting for the USB data lines to go inactive before issuing a CPU reset to continue the reboot process. Because the QDX USB bus is powered by it's own power supply the USB data lines remain active while the RPi tries to reboot preventing the RPi from rebooting. By placing a USB hub between the RPi and QDX when the RPi shuts down the USB bus the hub deactivates the data lines to the RPi and the reboot process continues normally. So the work around is to add a USB hub to the setup.