Same issue with me,
Do you have any solution from Sep 2016?
The best reference is open: Find iPhone, and you will see how the location blue point jump, I also sent a video with it to apple support.
I tried everything soft, hard reset, restore from backup, restore as new, etc, etc..., with and without wifi,
After multiple contacts, call and chat with apple support, a Sr supervisor requested to access my phone to perform some test and the phone is fine, they got a log of the problem from my phone and it is a "Location Crash"
The worse thing is, I was in contact with apple support since jan 14 and not solution yet, they only said " we are evaluating your case with our US Engineers", but no answer from apple to my last calls or emails i, it is really frustrating
I recommend you to open a CASE with apple support ASAP and keep in contact in this forum with the progress