First, the YI 4K plus camera currently can transfer or output the AV signal through the YI Type-C to RCA cable to a standard monitor that can accept the AV signal as well, which means that you have to purchase this special YI RCA cable online.
For second, if you can transfer the AV signal to your monitor initially while it fails for a certain time of usage doing this way, please confirm the following the information as below:
1,make sure the AV Out option in the camera menu is enabled before launching the AV output operation through the camera.
2, using a back-up YI RCA cable on your monitor and see if it works. If this solution is workrable it is indicating that the RCA cable is defective,thus you need to purchase a new one.
3,change other monitor to verify if it works. If this solution is workrable, it is indicating that there is something wrong with your monitor.
4,change back-up camera to verify if it works. If this solution is workrable, it is indicating that the USB port of the camera is failure or some parts of the camera are not functioning well.
If all above solutions are unsuccessful, please contact firstname.lastname@example.org for further assistance.