IPhone 6 shuts down at auto-lock

My husband and I each upgraded to the iPhone 6 in November. We have had zero problems until yesterday.
His phone shuts down automatically when the 5 minute auto-lock activates. I reset the phone "as new" but this has not solved the problem.
Prior to performing the reset, I turned on the phone and charged the battery as it had dropped to around 9% from 78% even though the phone was off for approximately 9-10 hours. I noticed that when the auto-lock feature was set, the phone would power off at the 5 minute mark, despite being charged. Once I turned off the auto-lock feature, the phone was able to charge to 100% and did not shut down on its own. We removed the phone from the charger and used it without incident. When the phone was not in use again, it shut down again.
Any recommendations are welcome!

Hey tfoxy74,
Welcome to the Apple Support Communities, and thanks for the detailed information. I understand that you are experiencing issues with your husband’s iPhone 6 shutting down unexpectedly. Usually, I would recommend attempting the troubleshooting steps in the following resources:
If your iPhone, iPad, or iPod touch doesn't respond or doesn't turn on - Apple Support
https://support.apple.com/en-us/HT201412
If your iOS device restarts, displays the Apple logo, or powers off while you're using it - Apple Support
https://support.apple.com/en-us/HT203899
However, it sounds like you have already completed one of the best troubleshooting steps, which was restoring the iPhone as new and holding off on restoring the backup. If this is true, then it sounds like the iPhone may need to be serviced. I imagine it is still well within the warranty, so you may want to check out the following website for information on obtaining warranty service:
iPhone Repair and Service - Apple Support
http://www.apple.com/support/iphone/repair/
Thanks,
Matt M.

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So, my iPhone is shutting down suddenly with battery at about 40% and saying that it ran out of juice, asking me to plug in the charger. When I do it, it shows 40% again. It looks like other people have similar issues with not only the 4S, but iPhone 5 as well.
I tried to contact the char support and well, read by your self below. Not only nothing was solved, but the support just hanged up the chat on me, and didn't answer my last question. That's really not what I expected from Apple. Well, that's it, no more iPhone in my household.
Case ID is 537464016 in case anyone from Apple wants to check it out. I'm selling this iPhone and never coming back.
Now Chatting with Calvin
Thanks for contacting AppleCare chat support. My name is Janan. Please give me a moment to look over your information.
Please note: In the event that we get disconnected it's likely due to a system or connection issue. It is never our intent to disconnect from you. If you do get disconnected, please chat us back or go to [Contacting Applehttp://support.apple.com/kb/HE57http://support.apple.com/kb/HE57] for phone support numbers and refer to the case number on the email that you've already received.
Hi Janan
Hi Luccas, how are you doing today?
Good thanks. I have an issue with my iPhone 4S
Luccas, from what I see in the pre-chat notes you provided, it looks like you are having an issue with Battery life. Is this correct?
Since I updated it with iOS7, the phone is shutting down suddenly when the battery is below 40%
I wait then about 10 min, or I do plug in the charge, and the battery shows 40% again
I tried to restore the phone using iTUnes
twice
but the issue is still happenning
Did you set up your phone as new after restoring?
yes
How long until the unexpected shut downs started up again then?
straight away
I found your diagnostics… Give me a moment to have a look?
ok
Ok, there may be an issue with your battery, but we’ll need to have you do some troubleshooting before we can verify that it needs replacing. How does this sound to you?
sounds good
One moment while I tic the boxes of the things you’ve already done please
ok
Do you show any appellations in your App store that needs updating?
no
Do you lock your iPhone when not in use to shut the screen off?
yes
How bright have you set your display?
it's on automatic
Do you use Wifi mostly?
at home and at work yes, so it's on wifi most of time
Do you have a lot of applications pushing notifications to you?
no, the phone doesn't have a lot of apps, especially after I restored it
Understood
Do you use your phone for emails?
yes
On your phone, would you go to Settings > Mail, contacts, Calendars > Fetch New Data for e please?
yes
it's set to push
but I don't use the mail app from Apple
I use the Gmail application
Ah… Ok
So there’s no email used there.
Back up to the Settings page please?
ok
Go to General > Background App Refresh now
yes, I disabled most of the apps her
I just have the Gmail app and the Google Maps
as these are the ones I use most
LOL… You are the perfect user!
What about Location Services?
it;s on, but again, just for google maps
Ok
and the find my phone service
Exactly
Let’s go back into General then Usage please?
Sorry, Nevermind, I can view that from your diagnostics...
ok
Do you use Instagram?
yes
That’s caused some memory issues of late...
Your battery is starting to show wear though
I didn't have any issues before updating to iOS7
the battery was working perfectly fine
never have any shutdown
Your battery is also 2 years old
One of the updates addressed battery issues and since you’ve restored your iPhone, it appears that it is on its way out.
the battery was 2 years old last month as well, when I had iOS6 and was working fine
I have done all updateds
I certainly apologize about the inconvenience this issue is causing.
But since you’re using your phone correctly, your restore hasn’t had any affect, this is the only conclusion I can reach
so, what's the solution?
can I come back to iOS6?
I’m afraid there’s no way to go back to iOS 6
so, I can't come back to the OS my phone was working properly, and I have to stick with a OS where my phones shutdown in the middle of the day with half battery full
Again, it isn’t the fault of the operating system software.
so, can you explain me why not?
if with iOS6 the battery didn't have a problem
and suddenly, when I update, I have an issue?
You have restored your phone and set up as new. If that fixed the battery life, then it was a software issue. If not, it was a hardware issues
look, if I come back to iOS6, the batttery issue is gone
so, it's a software issue
One moment while I get a senior advisor for you please?
ok
There’s just a few minutes wait time.
no problem
Just checking back… Our chat volume has gone up since Phone Support closed. This isn’t a normal wait but I’m still waiting with you.
that's fine
Still waiting with you
ok
Luccas, your problem requires extra knowledge and skill so I've got Calvin, one of my senior advisors taking over from here to make sure your problem gets the attention it deserves if that's okay with you. It was my pleasure to assist you today and I will leave you in Calvin's capable hands.
Thanks Janan
Hi Calvin
You’re welcome… One moment and I’ll transfer you
You are now being connected to another Advisor. Please standby.
Thanks for contacting iOS. My name is Calvin. Please give me a moment to look over your information.
Now Chatting with Calvin
ok
Hello Luccas, I see that your device is shutting down when the battery gets to about 40%, is that correct?
correct
I am really sorry to hear that, I can see that being frustrating.
it shows that image saying to plug in the charges as the battery is dead
I looked over the diagnostic it shows pass but its in yellow.
yes, especially if you consider that was working just fine one month ago before I updated to iOS7
I understand, it may cause people to think its the software but really what happens is during a restore or update sometimes it just brings the existing issues to the surface.
As even though your battery pass, its in yellow signifying its ready to failed but it appears its already failing.
Normal battery passes, its in green.
Since you have already restored it as new. That pretty isolated the issue.
sorry, I still don't get it. In one version of the software, my battery lasted the whole day without any issues. Now, after updating, the battery shutsdown at 40%. That's software issue for me. And, more important, if I wait about 10 to 15 min and try to turn on the phone. It's back again, and last until is about 30%, than, the same issue occurs.
If iOS6 was able to handle the battery just fine. I would like to be able to install it again
I understand you do have some concerns regarding iOS 7 and would like to revert back to your previous software. In order to avoid compromising your device in anyway the software is only designed to move forward. Downgrading the iOS is a feature that Apple cannot assist with as well as recommend since it can negatively affect your device.
However, we are always open to suggestions from our customers. Using this website (apple.com/feedback) would be the best option for submitting your concerns directly to Apple. We love to hear from our customers and future updates may even include specific features suggested to us by our customers.
Now keep in mind we have hundreds of millions of iOS device out there and most of them are running iOS 7 and running it fine.
In my case, upgrade the software affected negatively my device.
and a quick search on google shows that a lot of people have similar issues as me
Ok, we're running in circles here
You can do a search for iPhone anything and you will bring up a lot.
I though you would come and offer a solution
but you're just appologizing
not the kind of support I would expect from a premium product
The solution would be an out of warranty paid service.
not sure if would pay the premium next time
I don't see this as a solution. Because was an upgrade of software that made my phone stop working properly
I am sorry, I would have to respectfully disagree. I do agree that you notice the issue after the update. However does not mean that the update cause the issue.
So, explain me why in iOS6 it did happen?
I am sorry but there is just too many possibilities out there and I would just be speculating.
ok, so, at the same time that doesn't mean that the upgrade it's the cause, it could possibly mean that it's the cause, do you agree?
So explain to me why hundred of millions of units are running it fine?
I can't say about the hundred million of units
and that's not an issue that I care about
If even a fraction of the people had this call. I would not be talking to you as there would be huge backup of customers waiting.
what I care about is that the phone I paid 800 swiss francs is not working after a software update
I have a problem, and I'm contacting the customer service, so I care about being taking seriously and looking at the issue in my device
telling me that hundred of millions of devices works, and mine doesn't, that's not helpful
Ok, let me have you call phone support in you’re region. So that they can open up a engineering ticket and get you a response directly from engineering.
United Kingdom
(44) 0844 209 0611***
so, now you're saying that the last hour of my time has been useless because it's not you that can solve my problem?
and worse, you're making my self calling someone else and loosing even more time?
What I am saying is you are not accepting my solution and you believe you are correct.
So lets go with your direction to get you an answer directly from engineering.
no, you're asking me to pay for a new battery
That is my solution.
and you're expeculating that's the solution
you're not sure about that
You disagree so lets go get you an answer from higher up, do you not like that solution?
Lets agree to disagree and find you the answer you want.
Period.
ok, but I don't want to loose more of my time to call someone. And pay for the call
Debating this with me is not going to get us anyhwere.
I can setup a call back for you if you like.
you have access to the customer service system and could open a ticket
What number is best to reach you at?
+44 07445376676
just for my information
what they will look at?
anything they will do differently?
Call is schedule for 8:00-8:15 AM.
tomorrow?
Saturday.
Greenwich time.
ok, again, can you tell me what they will look at? anything they can see that you couldn't?
Thank you for your time.
Your chat session has ended. Thanks for using Apple's chat support

Sounds like you have a battry issue but don't want to believe it.
If a car was running fine on one tank of gas, then you filled it up with another tank of gas and it began to run funny, one might suspect that tank of gas. But let's just say coincidence blew a valve-- would you think the new tank of gas was the culprit?
BUT WAIT!! It just might have been! The gas could have been of higher octane and put more more strain on the valves; you know, like going from 87 octane (OS6) to 93 octane (OS7) and showing you the engine was on the edge of compromise.
Sometimes you have to go with common sense. If everything else is ruled out, it must be the battery. And if it runs fine one moment in OS6 but immediately ***** in OS7, I'd believe my battery was suspect-- though comfy-- in OS6 but the OS7 showed its true power.
Moreover, if you had the answer-- or didn't want to believe someone's more competent advice-- why did you even call? You've already shown that you don't know much when you asked if you could go backwards after setting up the new OS as a new phone.
Additonally, if you're such the know-it-all, but yourself the $29 battery and put it in yourself. It's a piece of cake.
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