IPhone problems. Internal? Software update will

My iPhone keeps shutting off and when I put it on silent it switches to sounds, silent, sound, silent and I don't know what it's on. I called apple they said to do a restore and if it doesn't fix it then I get a new one. First question. What can I do to the phone that a restore can't fix and they would have to give me a new one just invade the restore works

To be honest it could be a software problem or a hardware problem, it can depend on multiple factors for instance age of the iOS, age of the phone, Broke toggle button, so on if you have the 3Gs and above (3Gs, 4, 4s, 5, Soon to be 5s) you can update you software to the latest 6.0.1, or when 6.1 comes out. Updating the software can solve you problem if your iPhone is compatible. There are two possible ways to update you software from the device itself, and from iTunes. On iOS 5.0+ you can update from your phone.anything else you'll be stuck with iTunes update (when using iTunes make sure you go over to the side, right click you device, then click transfer purchases.)
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if you iPhone is older (3G and down) apple has officially dropped support so I would recommend getting a new phone if you can.
I'm really sorry if none of these helped you, Good luck.

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