If you are not using one of the recommended brands and Class ratings of SD cards you WILL have problems. (Class 10 is best, and UHS (Ultra High Speed) is better as well. )
It sounds like the SD card is damaged or not compatible with your bf's camera.
I have come to terms with the possibility of dying while riding, life has a 100% death rate. I would rather live having fun and end up dead in a motorcycle crash than never do anything fun because it's dangerous and I might get killed. No one makes it out alive anyway. - From a friend on another forum, used with his permission.