If the camera overheats it will shut off. Could easily be a faulty camera sensor. If you could get access to another GP that would be helpful to trouble shooting the issue. You may just have a faulty camera.
Trying searching google about the FW, since this seems more of a camera issue - downgrade fw gopro 3+
Trying searching google about the FW, since this seems more of a camera issue - downgrade fw gopro 3+