My iPhone 4S repeatedly freezes or restarts after upgrading to iOS 6

After my sleep button failed on my iPhone 4S running iOS 5, the Genius at the Genius Bar gave me a brand new iPhone 4S running iOS 6. Since then, I have experienced repeated freezes or spontaneous restarts - either I'll try to wake the phone from sleep, and it will not wake up, and I'll have to restart it manually, or I'll look over at my phone and see the Apple logo like it restarted on its own. Have other people experienced this in iOS 6, and if so, what's causing it?

Perhaps. I'm going to take it back to the Genius Bar where I got it and talk to them about it. Maybe it's a software issue (since I was using iOS 5 on the previous phone and am using iOS 6 on this one), and maybe there's a simpler fix than replacing the phone again, but if they think it's a hardware issue, then I'll get another replacement.

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My iPhone 4S repeatedly freezes or restarts after upgrading to iOS 6

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