Hi all, my camera on my phantom 4 pro only calibrates to 50% then freezes, any ideas guys, thanks in advance.

Hi there, please make sure that the drone has been updated to the latest firmware, you can try to refresh the latest firmware by the DJI Assistant 2. Then restart the drone and calibrate it again. If the issue persists, you may need to send back the drone for service.
You can start an online service request from https://repair.dji.com/repair/index.