Why is my iPhone taking hours to turn on?

My iPhone has been dying very frequently, sometimes it won't even stay on for 5 minutes. I usually plug it in and it turns right back on. But now, it has been charging for at least 3 hours now. What is wrong and how can I fix it?

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  • Why is 'other' on my iphone and why is it taking up so much? When I sync my iphone on my mac it shows me what's being used at the bottom in a bar (music, apps, photos, other). My 'other' is taking up 2/3 of the bar and I don't know what that data is from? What do I do to make that 'other' bar go down so that I can free up some room on my phone
  • Why does my iphone shut the call off at 4 or so hours? My boyfriend and I have been together for a while and sometimes we fall asleep on the phone, however, whenever we do I always wake up to the phone being disconnected. When i checked back at our phone history, it always hangs up the phone around 4 hours of talk time, even i its a full battery or its being left on the charger when we fall asleep. Is there some way to stop this?
  • Why does my iPhone battery die in 2 hours? My iPhone battery will literally die in about 2 hours. Why is this? I have a iPhone 4S 16gb running 7.0.6… Would buying a new battery and putting it in the phone make it just like new and give me a normal all day battery like what my buddy's get? I'm very frustrated.
  • Why does my iPhone 5 automatically hang up at 4 hours? Well me and my boyfriend talk endlessly on the phone for hours but right when we hit the 4 hour mark both our phones hang up, we have the same phone and it says the samething when it hangs up "call failure" how can I change this? Or can it be changed? Also, why does this happen?