What's going on with my iPhone 5S?

Been having issues lately. Will rarely read my finger to unlock the screen, sometimes the text message volume will be incredibly loud when I only have it set on volume 1 and my battery dies all the time. It will go from 40% to 12% instantly but the second I plug it in, it's back at 34%. I've let the phone die completely and have done a recharge, I never charge it overnight, I've deleted all my fingerprints and re-added them. Nothing is helping and I can't figure out what is going on.

More info, see comment below

This might be the cause of your operating system
If you have iOS 8, you should update to the lastest firmware because it was known to have alot of bugs like the ones you mentioned
If you don't, i'm not sure but you can go to your nearest Apple store or send it in for inspection

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