My iPhone 4 turns off suddenly. is this a battery problem or what?

I have an iPhone 4 that is 4-5 months old. It has recently started to turn off all of a sudden.
I can turn it on but then it does still keep doing it. I had iOS 5.1 installed. Since this problem,
I have in fact reinstalled it once again but to no avail. I am not sure that this is a software
glitch. Has anyone else experienced the same issue? What should I do?
Thanks in advance for all the help you can give...
Best,

Basic troubleshooting steps clearly outlined in the User Guide are restart, reset, restore from backup, restore as new device.
If you've been through ALL of these steps and you still have problems, then you'll need to bring your phone into Apple for evaluation.

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    From: iPhone, iPad, iPod touch: Turning off and on (restarting) and resetting
              http://support.apple.com/kb/ht1430
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    Battery does not charge from the USB power adapter
    Important: Only original iPhone can be charged from a FireWire-based power source. If iPhone is connected to a computer that's turned off or is in sleep or standby mode, the battery may drain.
    Verify that the outlet being used is working.
    Try another USB power adapter if available.
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    iOS: Device not recognized in iTunes for Windows
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    or
    iOS: Device not recognized in iTunes for Mac OS X
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    Message was edited by: mickyel

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