IPhone 3GS turning off for no reason

My iphone 3GS is about a year old, is running 4.1 and in the last week has started turning itself off despite the battery still being about half full. Has anyone else had this issue, and if so is there a fix?
Thanks
Mandy

Try a reset first. Press and hold the Sleep/Wake button and Home button at the same time. Wait until the phone shuts off and release. It will restart.
If that doesn't work, you should restore it using iTunes.
Beyond that, it would probably be a hardware issue and you will need to have it serviced.

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