IPhone 5s iOS 8.1.2 turning off at random battery percents?

For Christmas i was lucky enough to receive and iPhone 5s, upgrading from my 2 year old iPhone 4s which had a terrible battery life and numerous other glitches. All excited on Christmas day i restored my brand new iPhone 5s from the back up of my old iPhone 4s, then on that very day, my phone died at 55%, tried turning it back on and it indicated that i needed to plug it into a charger. i waited a minute, tried turning it back on, and it worked, showing that it had 53% left? so i continued to use my new phone, i was playing music out load and using Facebook messenger, then again it suddenly died, this time at 48%, tried the same method mentioned previously with the exact same result.
Searching the internet for possible solutions, i tried a "DFU Restore". DFU stands for device firmware update. This did not provide any fix to the battery issue, the following day it suddenly shut down at 60%. I again tried a "DFU Restore" only this time i did not restore it from a backup, the first DFU "Restore" i restored it from the backup of the phone, the second time i didn't wondering if the issue was related to the backup. The second time worked, at least for a few days, then again it suddenly shut down with plenty of percent left.
In Summary:
My Brand new iPhone 5s with the latest iOS is randomly shutting down with plenty of percent left and then requires either charging to turn back on OR wait a minute or so and it will be able to be turned back on, only for the same thing to happen a minute later.
I do not think my phone is incorrectly reading the battery level as it seems to be used at a normal rate.
I have Tried:
Restore
"DFU Restore"
Draining battery to 0% and charging to 100%
Verbally abusing my iPhone
All with no fix to my problem
I am asking for advice, what else should i do? is their a fix that i don't know of? should i replace the battery? i don't know what else to do....

You should get your phone checked by visiting an Authorized Apple Service Provider or Apple Store next to your place.
You can also contact Apple Support and talk to them. They can check the battery online, visit this page to do that:
iPhone - Contact Support - Apple Support
Click on Apple Support, then on ->Battery, Power &Charging ->Battery questions and troubleshooting, and follow the instructions.

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