IPhone 4 Keeps Freaking Out?

I've had my iPhone no longer than a week and it keeps doing what it wants (literally) it responds to unregistered touches. It's difficult to unlock too as when sliding the arrow it just keeps going back to its original position, also making it harder to turn it off too (however I did manage to turn it off and on again and that didn't seem to help at all.) It types random things and opens apps I don't want opened. What should I do? Take it back to the Apple store and ask for an exchange?

Yes but they might restore the device instead of the exchange

Have you got it wet? It could be because of that. Try putting it in a bowl of rice. But if that doesn't work, take it to the Apple store and get a refund.
Hope I helped.

Other you let be flashed or do the factory settings by you or an expert or send it to Apple store

There's probably something wrong with the screen if you've only had it a week take it to the apple store go to the genius bar tell them what is wrong with it and they will either fix it or give you a brand new one
i had a problem with my MacBook that is what they told me to do

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