My P4 ducked behind a hill today as it often does. I lost signal and waited for RTH to trigger, it never did. I tried manual RTH, nothing happened. I walked the 200 yards to see what a I could see. The P4 was on it's side on the near by street. Broke the internal gumball mount and the left front arm. As we all do I tried to see if I could figure out what happened. I fired it back up, which was successful though not flyable, and checked settings. Noticed my RTH altitude was set to 0ft. I did not reset it from my last flights and I have not done anything to the tablet that would have even accidentally reset the app. Anybody else had this happen?