Why does my iphone 3gs freeze?

After aprox 2 mins of chattin my phone freezes, about 1 min later it comes back on again, anyone know why

Iphone 3gs! That model is out of date now. I suggest you to upgrade to the iphone4/4s.

You may have a battery issue. Plug the phone into the wall and see if it reoccurs. If it still happens, close out all applications (IOS 4+) by double tapping the home button, then holding the applications until they start jiggling and click the minus (this will not delete them). Then preform a hard reset. (Hold home button and power button until it flashes off and on. If it is a battery issue get it replaced here: http://www.apple.com/...ments.html

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