The pixhawk4 mini is powered by the power supply port, the telement1 port is connected to the digital transmission, and the usb port is connected to the Raspberry Pi (on-board computer)
At this time, if you use the QGC ground station data transmission to send the reboot command, the pixhawk4 mini will not be turned on after it is turned off.
This problem may be a power supply problem or a signal, because the usb port and the power supply port are connected to pixhawk at the same time, and the usb port and the telement1 port are equivalent to connecting two ground stations.
This is not possible. Unplug the USB cable connected to the Raspberry Pi, and then reboot through the data transmission, and pixhawk will be able to restart normally.
Therefore, it is recommended not to connect the onboard computer to pixhawk through the USB port, and try to use the uart port or telement2 port as much as possible. I connected it with the usb port because the pixhawk4 mini does not have a telement2 port and redundant serial ports.
At this time, although pixhawk can restart normally, the Raspberry Pi may shut down again after the restart. It is not clear why.