While rebooting a Raspberry Pi 4B with a QDX Rev 3a attached the reboot stalls at a blank screen after the OS shuts down. The RPi will remain in this state until either the power is removed from the QDX or the QDX USB cable is unplugged. Have tried a couple different power supplies for the QDX as well as the RPi. The RPi reboots normally without the QDX attached. The QDX is setup for 9VDC.
Jeff Nonhof KD8THX