You don't need to download an app my friend, when you go on to camera there's a button that switches to the front camera, I think its the first option?

 

yes like jackdsparker94 said there is no need to an app .

A simple reboot is always my first line of defense with a bug... reboot; its some kind of stupid but it works with me many times I'm not sure if that's really necessary, but, I never have any problems with my camera.

also the documentation that came with your phone suggests you shut it off for one minute every day so for me i shut off my phone every day in the class, and turn it back on when I finish

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