Iphone 4s camera not working?

I have this iphone 4s since 1 years and all of sudden camera stop working when i try to take pic it switch back to main screen and don't take any pic

Back up your iPhone and reset
Settings > general > reset > content and settings
Then the camera will work fine

Reboot phone, work now?

If not, hard reboot (hold power+menu key until apple logo appears)… Work now?

If not, wipe all data and itunes restore… Work now?

If not, call apple cause your have major software and hardware issues.

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