I phone turns off unexpectantly and then restarts

after a few minutes of being switched on the iphone 3gs turns itself off and then restarts.  I have tried to update the software but there are no updates at the moment.  I attempted to reset the phone but in the process it again turned itself off.  It has had a full battery when it has done this.

You probably have to put it in recovery mode and restore it, as explained here: http://support.apple.com/kb/ht1808.

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