My iPhone 3GS keeps turning off for no apparent reason?

My iPhone 3GS sometimes turns off for no apparent reason? Sometimes this has happened mid-call but mostly it just happens upon random, if anyone knows how to solve this problem or has had this problem In the past, I would be grateful for any replies. Thanks

Having the same problem but unfortunately not covered 
Noting i have updates to latest os software 4.3.5  in Aug 5th but it happened to me again?
is it battery problem? Shall i send it for service and maintenance??
Thanks

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    <Edited by Host>

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