Solution
When you see the warning "Overheated! Shutting down.", turn your camera off and wait for at least 3 minutes.
Turn off the camera and wait for at least 9 minutes in order to shoot 4K movie up to 9 minutes 59 seconds and High frame rate movie up to 7 minutes 29 seconds.
(Depending on the shooting environment and operating conditions, the actual shooting time may be shorter than the times specified above).