This appears to also be affecting my s3 here too, same update on omnirom
I see in changelog on omnirom though there were no new commits specifically for i9300
I think I found the problem with the camera! The problem is when when we change the storage location to SD card. Using the internal memory, I alternated between camcorder and camera, filmed, took pictures and showed no problems. When used as a storage location external SD card for the camera to function, and to restart the application. I did the tests with a brand new memory card. Here is a hint for developers discover what happens. Thank you!