IPhone freezes when I open any media?

I have an iPhone 4s and only for a few months. Recently any time I open any media including:
My pictures
Music apps (songza and pandora)
Videos (YouTube, Vine and the netflix/amazon prime/hulu+ apps)

When I open these apps it either-
-Freezes (I can get out of it by hitting the home button)
-opens then quits itself (closes)

**even when my phone is fully charged and have strong Wi-Fi**

Is this something I can't fix on my own or do I need to go down to the apple store?

Hmm sounds quite unusual. If you're Jailbroken it could be a tweak causing the problem.

If not then I recommend doing a backup and restore via iTunes on a computer in your house and that should fix just about any problem.

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