Camera stopped receiving power. To keep it online and avoid draining its battery, reconnect power soon

Two of my cameras have an error message, "stopped receiving power. To keep it online and avoid draining its battery, reconnect power soon." One is a stickup camera connected to a wall socket The other is a spotlight camera connected to a solar panel. So far I have switched power cables with a device that does not have that issue, purchased a new power cable, used different wall sockets, and purchased a new battery. I have also set up the camera as "wired" and as "battery" for the power mode. I have rebooted the devices numerous times and uninstalled and reinstalled the app. Finally, the error message appears when I use Apple and Android devices.