Why is my iphone 5 rebooting and freezing under iOS 7?

My iPhone 5 worked perfectly every day for a year. Now that I've upgraded to iOS 7 it freezes frequently and reboots itself every few hours. What is wrong and how can I fix it?

I take it you've got the original iPhone 5?
If so, I highly recommend that you switch these off in Settings:
1) WiFi
2) Bluetooth
3) Mobile Data (internet usage via 3G etc)
Don't leave them running for long periods, they'll drain your battery at an alarming rate, even with Mobile Data turned on, your battery won't last for more than 3 days!!
Mobile Data is found in 'Mobile' in settings.
Also, some Settings that will cause a fairly gradual drain are:
1) Privacy>Location services>System Services - Turn off: Location based iAds, and Location Services (uses GPS)
2) GPS - Turn off
3) Change your Brightness to the second "s" in brightness
4) iTunes and Appstore settings - turn off automatic download updates if your really desperate
5) General>background App Refresh - Turn off
Note that some apps make extensive use of internet, eg. Facebook and Twitter and such, you'll have to manage these much tighter than normal. As in, don't leave them running in the background, quit those apps, as they'll keeping using the internet (checking for updates) when not in use by the user.
After you've done these, make a note of the percentage battery at the time, and leave it in sleep mode for an hour. If it's used about 1% or none, then you're back to normal battery usage, and it's fixed it.
Let us know what happens.

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I believe the problem has been solved!
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For troubleshooting issues in regards to your iOS device unexpectedly restarting the following Knowledge Base article offers some practical steps:
If your iOS device restarts, displays the Apple logo, or powers off while you're using it - Apple Support
Thanks for reaching out to Apple Support Communities.
Cheers,
Pedro.

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