Thought I'd recharge the battery with the USB port into a standard USB power supply. The GP9 is uncomfortably hot. It started cooling down as soon as I removed the USB cable. Is this normal? Is it good?

Anyone having issues with hero9 shutting down due to overheating? Purchased new camera, used it twice and found the recording stopped short each time. Further investigation showed that the camera becomes very hot ( greater than 50 deg C) and then shuts down. Returned camera for new one. First...