How to get an iPhone 4S replacement?

I have an iPhone 4S. It is currently still under warranty. So my iPhone has multiple issues wrong with it. The first one is that the battery life is HORRIBLE. I have went to Apple over this before, but they told me to do a software restore. My phone also has issues when it rings. Sometimes it will ring.other times it will not. Sometimes the screen will go black for a little while and then come back on. This isn't an all the time thing. It does it often and it gets very annoying. Also. The screen will flash when somebody calls me sometimes. These ring issues happen regardless of whether or not it is on vibrate or loud. Also, my phone gets VERY hot sometimes. This can be while watching something on HBO Go or just charging. I mean it gets VERY hot. It's been to where it has made me uncomfortable to hold. I'm just wanting a replacement because I know the warranty will go out sooner or later and I don't want it to become an issue later. What should I do and do you think these are valid reasons for the Genius Bar to give me a replacement?

None of those reasons will get you a replacement.
I work at the genius bar, as long as your warranty is still good, no water damage, no jailbreak.
come i and say your home button doesn't work sometime.
say sometimes you have to press it 5 times before it works sometime.
you will be a refurbished replacement.

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