Was flying my P3P this morning about a mile up a long narrow creek (I'm blessed with excellent eyesight ...). Beautiful fall foggy morning. Using IPAD mini 2 as a display - started with only 45% battery on the IPAD, full battery on the drone. Usually would have charged up the IPAD - but seemed like plenty for a 15 minute flight. Suddenly the IPAD indicated it had only 10% battery left , usually still good for more than 20 minutes - but it suddenly shut down completely and wouldn't restart. Lost sight of the drone in a fog bank - so hit the RTH button - wondering if anything was happening. Someone on this forum always admonishes us to practice this for situations like this. I have practiced this a few times - but with the display working, It asks do you really want to RTH, are you sure etc. Not having the display working - no sign of drone after several minutes - I was nervous to hit the RTH again since that could then cancel the RTH function. Finally re-hit the RTH - and heard the beeping indicating it was active. Drone landed at my feet a few minutes later- whew! A lot of us fuss about things DJI could do better - but actually have to say this is a pretty incredible - well thought out product Merges technology from battery to camera - plus gimbal & gps plus flight qualities and software. Looking on google - apparently this not an unusual IOS problem - shutting down with half battery life left. See a lot of folks have had this problem - solutions seem a little vague. Anyone had this problem and found a fix?