Why is my iphone camera being like that?

Whenever i go onto my camera its either not turning on or it is for 3 seconds then it frozes? Its been like for the pass 3 days, what's the case? Can someone tell me?
its an Iphone 4 btw

I got an i4 too! Maybe a phone update?

It could be a software bug, but if you are jailbroken, just restore. If you're not jailbroken, try restoring anyways.

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