iphone 5 can not stop recording -bug

This morning after I took a video of snowing using iphone 5, my iphone camera can not stop recording, even I turn off my iphone. Finally I found a solution, fist disable camera under settings,
then enable camera again.

Go to Settings in iphone 5, click settings,  click General,  Go to "Restrictions", first "Enable Restrictions" (need to create and enter password), then disable camera.  Camera icon will disappear from the main screen. Then click "Disable Restrictions"", enter password and enable camera. The camera will stop the hang of recording.