My iPhone 4S is being super slow and glitchy?

I've experienced tons of problems with it within probably the last 2 weeks. It used to run fast with no freezes and no glitches, but now I hate using it anymore! Here's what's been happening:
-doesn't save pictures I take
-Instagram closes every time I use the camera
-it'll freeze when I'm looking at my messages
-new messages won't show up on the lock screen
-it freezes when I unlock it
-the buttons won't lock it or go home when it's frozen.
-calls won't end

It hasn't been dropped or anything! I can;t figure out what's wrong. If I took it to Verizon could they do anything?

Have you made any new updates or changes to your phone? Sometimes the iPhone will act up afterwards. Either way, go to your local Apple store and they are really great in finding out what is wrong and if there's anything they can do to fix it, especially if it is still under warranty.

Restore it

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