One of the first questions I would ask would be, are there any applications that are running in the background?
While iOS is pretty good at managing background app use, there are some apps that don't play well. Particularly, Skype.
You've also mentioned that the phone has been replaced twice already. It may be that the battery in all cases might just be bad. Having the "Geniuses" check it again would be worth it. Even having the phone replaced again may be worth it.
I've used an iPhone since its introduction, in 2007, and have not experienced a problem like you mention.
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