IPhone 4S blocks when changing camera stance?

My iPhone blocks when I try to change the camera from back camera to front camera. It started doing so a couple of days ago for an unknown reason. It still reacts normally otherwise, like if I double tap the home key I can terminate the camera process but when I restart it it stays the same.

Have you tried pressing the home button and the lock button at the same time, keeping them held down as the phone turns off, then the apple logo will appear. At this point you then let go of the buttons. Doing this acts as a reset and usually solves little niggles

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