How can I tell that it is a hardware issue or ios bug issue with Iphone 4S Battery life & flapping 3G?

Hi There,
My Battery dies real quick on 4S compared to 4 eventhough my wireless is off, location services are off, the only thing on is the cellular data. I even adjusted the brightness to 60%.
Another issue is that My 3G connection keeps flapping, goes & comes in a wierd way where it falls back to Edge.
Am I to consider this part of the issues i can see so many people facing & therefore consider as ios bug & wait for the update or should I take it over to a service center to check the phone for me which means waste of time to get it done.
Kindly advise from your experience

It's almost always a software issue. Actual hardware problems are rare but can get very serious, if you recall the antenna issue last year.
Reception problems just depend on how strong the signals are at your location. But if you're dropping to Edge even in strong areas, it wouldn't hurt to have an apple store look at it.

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