My iPhone 3GS keeps restarting automatically?

My iPhone 3GS keeps restarting it is not turning on without a charger when I charge it it keeps turning off and on in seconds then it goes back on then off all my apps are moved. But I don't really want to remove all my data and all that as a new iPhone. When I remove it from charger its not even turning on.

Sorry but you have to reset your phone from itunes by clicking on restore button which is next to update…
is your mobile jailbreaked?
and secondly you can't backup your data bcz your phone is again n again turning off!
it is better you give a full fresh reset to your phone so it will remove each n evry corupt file from it
HOPE THIS WORKS.

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