My iphone 3gs turns off within 6-7 minutes of call

I am having iphone 3gs. I have upgraded it to ios 4.2  one year back. But since last 3-4 months, my iphone turns off during call specially when call goes beyond 6-7 minutes. Please help me..... as it is very frustating.

try this one ist
go to settings>general>reset>rest all settings phone will turn off and turn on by itself
once the phone is press and hold the home and power button at the same time wait for the apple sign then release the buttons phone will turn off and on
or restore the phone from your back up,before you encounter the problem or restore as a new device

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