Tried some flying in Course Lock tonight with my P3A.  Latest firmware and app.
Everything was working fine then the video and application froze.  
I'm using an iPhone 6 on latest iOS.
I couldn't even quit the app.  Had to restart the phone.  

I tried it again after recovery and the same thing reoccurred.


I was comforted by the fact that the P3A fails aged and began to return home each time.  

Before you ask, I calibrated compass before takeoff.  

Ideas ?

you can always try another phone, aka borrow one or something.  Try to figure if its the phone or some kind of memory conflict going on