My iPhone 5 continually restarts. What do I do?

My iPhone 5 is continually restarting by itself, and I'm not sure why. If I try to hold down the sleep button to turn it off nothing happens. Then if I try to restart it by holding the sleep button and the home button at the same time for ten seconds then some times it'll stop restarting but it won't turn on. Then if I turn it on like I normally would, the phone will just keep going back to restarting forever. Also, when I plug it in to the charger, nothing happens. So I'm not quite sure what to do. Any ideas?

Hello there, GorakkHowk.
The following Knowledge Base article offers up some great troubleshooting steps for unexpected power off of your iOS device:
iPhone: Hardware troubleshooting
http://support.apple.com/kb/ts2802
Will not turn on, will not turn on unless connected to power, or unexpected power off
Verify that the Sleep/Wake button functions. If it does not function, inspect it for signs of damage. If the button is damaged or is not functioning when pressed, seek service.
Check if a Liquid Contact Indicator (LCI) is activated or there are signs of corrosion. Learn about LCIsand corrosion.
Connect the iPhone to the iPhone's USB power adapter and let it charge for at least ten minutes.
After at least 30 minutes, if:
The home screen appears: The iPhone should be working. Update to the latest version of iOS if necessary. Continue charging it until it is completely charged and you see this battery icon in the upper-right corner of the screen . Then unplug the phone from power. If it immediately turns off, seek service.
The low-battery image appears, even after the phone has charged for at least 20 minutes: See "iPhone displays the low-battery image and is unresponsive" symptom in this article.
Something other than the Home screen or Low Battery image appears, continue with this article for further troubleshooting steps.
If the iPhone did not turn on, reset it while connected to the iPhone USB power adapter.
If the display turns on, go to step 4.
If the display remains black, go to next step.
Connect the iPhone to a computer and open iTunes. If iTunes recognizes the iPhone and indicates that it is in recovery mode, attempt to restore the iPhone. If the iPhone doesn't appear in iTunes or if you have difficulties in restoring the iPhone, see this article for further assistance.
If restoring the iPhone resolved the issue, go to step 4. If restoring the iPhone did not solve the issue, seek service.
Thanks for reaching out to Apple Support Communities.
Cheers,
Pedro.

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"APPLE HARDWARE/SOFTWARE PRODUCT PROBLEMS WITH MINE & WORLDWIDE"
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24-06-2011
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My 1 year old -- ha! one month out of warranty -- iPhone 4 has been having a nearly identical problem over the past few days.
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It then worked again for a moment but started doing exactly what you describe, going through a reset cycle (longer than 30 seconds but who's counting). And it felt quite warm.
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Hello EustaceRM,
Force closing all open apps and resetting your iPhone may help prevent the various app issues you've been experiencing.
iOS: Understanding multitasking
http://support.apple.com/kb/HT4211
iPhone, iPad, iPod touch: Turning off and on (restarting) and resetting
http://support.apple.com/kb/HT1430
If your apps continue closing unexpectedly, the next step would be to restore the device.
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http://support.apple.com/kb/HT1766
Additionally, the troubleshooting steps detailed below can help stabilize your iPhone, should it continue restarting or powering off unexpectedly.
Verify that the Sleep/Wake button functions. If it does not function, inspect it for signs of damage. If the button is damaged or is not functioning when pressed, seek service.
Check if a Liquid Contact Indicator (LCI) is activated or there are signs of corrosion. Learn about LCIsand corrosion.
Connect the iPhone to the iPhone's USB power adapter and let it charge for at least ten minutes.
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The home screen appears: The iPhone should be working. Update to the latest version of iOS if necessary. Continue charging it until it is completely charged and you see this battery icon in the upper-right corner of the screen . Then unplug the phone from power. If it immediately turns off, seek service.
The low-battery image appears, even after the phone has charged for at least 20 minutes: See "iPhone displays the low-battery image and is unresponsive" symptom in this article.
Something other than the Home screen or Low Battery image appears, continue with this article for further troubleshooting steps.
If the iPhone did not turn on, reset it while connected to the iPhone USB power adapter.
If the display turns on, go to step 4.
If the display remains black, go to next step.
Connect the iPhone to a computer and open iTunes. If iTunes recognizes the iPhone and indicates that it is in recovery mode, attempt to restore the iPhone. If the iPhone doesn't appear in iTunes or if you have difficulties in restoring the iPhone, see this article for further assistance.
If restoring the iPhone resolved the issue, go to step 4. If restoring the iPhone did not solve the issue, seek service.
My issue is still not resolved. What do I do next?
Contact Apple Support.
iPhone: Hardware troubleshooting
http://support.apple.com/kb/TS2802
Cheers,
Allen

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My iPhone 5 continually restarts. What do I do?

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