Hello @garyg41. Make sure that a recommended SD card is used for your camera. Using SD cards that aren't recommended can cause issues like freezing as the card isn't fast enough to write the content, the camera getting hot or battery consumption is higher than normal as the camera stays in an active mode trying to sync to the card.
Reinstalling the firmware update of the camera can also help correct any errors with the current software installation. Using an SD card adapter, connect your microSD card to your computer and follow the Manual Update instructions specified in this article: https://community.gopro.com/t5/en/How-to-Update-GoPro-Cameras/ta-p/394229
Additionally, performing a factory reset in the camera may help.
