IPhone 6 shuts down with 40% battery life

Hello,
I have an iPhone 6 (64 GB) on T-Mobile running iOS 8.0.2 that shuts off when the battery indicator says about 40%. I could be using it like normal, then it just shuts down and flashes the red battery logo and tells me to plug it in. It comes right back on when connected to power and then it is good to go. I haven't tried to run it back past 40%, again, but the phone consistently powers down around the 40% mark.
I set up the phone with an import from my iPhone 5S and I got into the "death spiral", where the phone was stuck in a constant reboot unless I did the hard restart (power and home button until the phone restarted). I think I fixed that by deleting the apps that were loaded from my 5S backup and installing them fresh from the app store.
I am restoring the phone right now and will load the backup from the iPhone 6.
Has anyone else had this problem?
Thanks,
Matt

It could be an issue with the battery calibration. I would go threw with the restore, set the device up as new, then restore from the backup. If that does not work then it is hardware related and most likely a battery issue. If you have an Apple Retail Store near you could take it in there for battery replacement, or you could call Apple Care and they have mail in options. You will want to make an appointment for the Apple Retail Store if you choose to go that route.
Make an appointment: Apple - Concierge
Contact Apple Care: https://getsupport.apple.com/GetproductgroupList.action

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