12-17-2019 09:43 AM
Is your card showing 117GB uses when it's in the PC or when it's in the camera? If you remove the MP4's from the card but leave the thm, lrv and wave files, the card may incorrectly report that there's more space being used than actually is.
You may also want to check your GoPro app on your phone. You may have set it up to automatically copy the footage from the camera and delete the footage on the camera, hence some footage may still be on your camera and some may be still on your phone.