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Sep 16, 2016 12:31 PM in response to RussH11by SnickZ.,Hi there, RussH11!
Thanks for using Apple Support Communities! It looks like your iPhone 6s is unexpectedly shutting down. This could be either a software problem or a hardware problem. I'll be happy to help you figure out which.
1. How to back up your iPhone, iPad, and iPod touch -- Since the path to finding out which is done by completely erasing your iPhone, please take a moment and back it up. I want to be sure your personal information is safe.
2. Use iTunes on your Mac or PC to restore your iPhone, iPad, or iPod to factory settings -- You'll need to use iTunes on a Mac or PC to completely erase your iPhone. Using the Settings only removes your personal information.
First time through, select "Set up as new iPhone", and log into iTunes & App Store and iCloud. Once you're back to the home screen, sync your iPhone with iTunes to put at least some of your information and media back on the device. After this use your iPhone for a bit. If your iPhone has stopped shutting down unexpectedly, continue to the next step. If it continues, however, then the problem is with the device itself. You can click the "Contact Apple Support" link in the "Get Help" section at the bottom of Use iTunes on your Mac or PC to restore your iPhone, iPad, or iPod to factory settings
3. Restore your iPhone, iPad, or iPod touch from a backup -- Follow the steps in this article to replace your personal information on your phone.Hope this helps!
