Good Morning v1000004,

If your iPhone continuously restarts, you may need to update the iOS.  See the resource below:

If your iOS device restarts, displays the Apple logo, or powers off while you're using it - Apple Support
http://support.apple.com/en-us/HT203899

If your iOS device restarts, displays the Apple logo, or powers off while you're using it

You might see this unexpected behavior on your iPhone, iPad, or iPod touch if you have an older version of iOS. These steps can help. 

 

Make sure that your device is up to date and your apps are up to date. If you still see this issue after updating, contact Apple Support.

Learn what to do if your device won't start up past Apple logo or doesn't respond.

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Last Modified: Jan 19, 2015

Hope this helps ...

- Judy