IPhone Turning Itself Off - Failing to Wake Up

My iPhone 3G has been turning itself off/failing to wake up for a couple of months now. I've tried restoring it and deleting iTunes and then reinstalling. Apple support tried and couldn't fix and said it was an iTunes issue. Their suggestions didn't fix anything and I'm getting really frustrated. I have found several forums on other sites in which lots of people are having this same issue. iPhone is not jailbroken, hasn't been abused, etc. I've turned off push notifications b/c one forum said this would decrease the problem. My phone turns itself off randomly when in sleep mode for no apparent reason. I can do a hard reset and it will come back on after several seconds, but phone calls and texts have been missed. Sometimes they don't show up for several more minutes after the phone is turned back on. This didn't start until around when I updated my software a couple of months ago. Maybe OS3.1? Help, help, help!!!

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Remove the phone from its case and try this...
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http://support.apple.com/kb/ht1430
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Charge it for 15 minutes with the wall charger, then hold the HOME and SLEEP buttons for at leat 15 seconds or until an Apple logo appears.
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HT201210 my iphone turned itself off and wont turn back on. I have tried pressing both buttons to reset and also when promted by itunes tried to restore the phone but I get a error message stating unknown error. Can anyone help/advise? thanks

can anyone help or advise please?

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Try resetting it by holding the home and power keys down until the Apple logo appears.
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Hi that worked for me! I thought it was a battery problem. I knew if I came to the Apple iPhone forum I'd find the answer. Now I've got to find some answers on increasing the battery charge as my phone is dead by 8 PM and I charge it fully every night!

Phone just turned itself off and wont turn back on

iPhone turned itself off and won't turn back on

Nope you won't lose any data, it just like restarting your PC.
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Well, the sleep/wake button is also the power button. If you cannot use it to turn on, then you cannot use it to perform a reset by holding it and the home button together until you see the Apple logo.Those are the only two ways to turn the device on. You can try letting the battery go completely dead and then trying to plug it in. After it has charged for 20-30 minutes, the device may come back on. But, without the sleep/wake button, there is no other way to turn the device on or off.

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My iPhone 4S keeps turning itself off when I still have battery life and then it doesn't charge?

It's only just started doing this and it's really annoying me now!! Ha
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Hi there glee154!
I have an article here that can help you troubleshoot this issue with your iPhone. The article is about troubleshooting a multitude of iPhone hardware issues, and can be found right here:
iPhone: Hardware troubleshooting
http://support.apple.com/kb/TS2802
The specific section you will want to reference can be found here:
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 LCIs and corrosion.
Connect the iPhone to the iPhone's USB power adapter and let it charge for at least ten minutes.
After at least 15 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 coming to the Apple Support Communities!
Regards,
Braden

IPhone Turning Itself Off - Failing to Wake Up

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