06-03-2020 07:39 AM
It's possible that you have an SD write error and there's a couple of things that can cause this.
1: Make sure you are using a recommended GoPro SD card.
2: Make sure you have formatted the card in the camera before using it.
3: Perform a manual firmware update.
4: If the problem persists, try using a different SD card completely (and format it in the camera before use).