My stock camera app stopped working on my S3 today. When I open it up it just has a black screen and none of the options work. I tried using the camera in another application and it keeps telling me another application is using the camera and to close that app or restart the phone. I have restarted it a few times but the camera is still locked up. I went to App manager and forceclosed it as well as cleared the cache but still nothing. Help! Any ideas on what to do?