Why is my iPhone rebooting?

I purchased an iPhone 6 (T-Mobile/unlocked) from an Apple Store in Dallas on Dec 17th. It has had iOS 8.1.2 on it from the beginning. I have not had any problems with it until the last couple days. All of a sudden it is rebooting on it's own. i.e.... I hear the "ding" and when I look at it, all I see is the black screen with the white apple. It boots quickly and I can get back into it with no problems other than I have to enter my code rather than TouchID (since it rebooted).This happened at least 3 times yesterday and twice already today.
I also have a iPad mini (w/Retina) 128G with iOS 8.1.2 and am not experiencing any issues with it.
Suggestions? pointers? help?

Try hooking up to iTunes, do a back-up...restore the iOS...restore the back-up and re-sync to iTunes...and, if issues persist, as noted below... A visit to an AppleStore GeniusBar is in order.

Hello
You can try restoring your iPhone 6 and see if that solves the issue, if it doesn't, I would take it back to the apple store.

I hope the restore works....

Unfortunately I am now in back Brazil (a missionary) and a visit to a genius bar is a little out of my budget! lol

Originally Posted by randally

I hope the restore works....

Unfortunately I am now in back Brazil (a missionary) and a visit to a genius bar is a little out of my budget! lol

I think the Genius Bar is free, but if you have to have a product replaced it may end up costing money. 😀

Originally Posted by randally

I hope the restore works....

Unfortunately I am now in back Brazil (a missionary) and a visit to a genius bar is a little out of my budget! lol

All iPhones come with 90 days free phone support and a 1 year warranty. So I'd call Apple. Since you bought it in the US, I'd recommend calling the U.S. AppleCare number not a number local to Brazil (I have no idea if here is one or not).
At best they can help walk you through a restore and help you resolve the problem. At worst, they determine its a hardware issue and you have to ship it back to them and they send you a replacement.

If restoring the backup results in the same issue then I'd just restore as new and see if that fixes the issue (which I think it will).

In case anyone else reads this....
I ended up contacting Apple Service and they jumped all over the opportunity to replace the iPhone. Unfortunately, I still ended up paying to ship it to the US. After I received the replacement, I discovered they had sent me a "locked" phone. Once again I called Service and after they reviewed the service record, they realized they had not sent me the correct (unlocked) phone. Nevertheless, they arranged to have the iPhone unlocked (within 12 hours of first contact) and I have been using that iPhone now for almost 5 months with no more issues.

Originally Posted by randally

In case anyone else reads this....
I ended up contacting Apple Service and they jumped all over the opportunity to replace the iPhone. Unfortunately, I still ended up paying to ship it to the US. After I received the replacement, I discovered they had sent me a "locked" phone. Once again I called Service and after they reviewed the service record, they realized they had not sent me the correct (unlocked) phone. Nevertheless, they arranged to have the iPhone unlocked (within 12 hours of first contact) and I have been using that iPhone now for almost 5 months with no more issues.

Outstanding, and thank you for the update...:)

Glad to hear everything's worked out for you!