Scariest Drone Moment yet occurred today with my Phantom 4. Out here at the Blue Water Bridge, in Port Huron, MI. It was 90 degrees out in the open where I sat down and decided to test max range because of the wide open flat waters in front of me. So, off I sent Casper, my P4 with a pair of copper half-self antenna range "boosters", 60 feet up at 45-57 mph in sport mode right over the open lake. 5500 feet 11,000 feet 17,000 feet - just over three miles, just what the manufacture claims. When, suddenly, not a signal failure or other DJI Go app message but: ** iPad needs to cool down before you can use it ** pops up on the screen, and 10 seconds later the iPad just turns off! Casper is 60 feet up and 3 miles away facing a 10-12 mph head wind, in the middle of a lake. I rush back to the car (controller likely loses connection as I'm doing this) and turn on the AC blowing on the iPad. Two minutes later the iPad turns on but it won't connect to the drone. I try various things including killing the app and relaunching and finally it connects... Clever Casper, automatic return to home mode active! He's been flying home, at approx 10-25 mph) on auto pilot ever since we disconnected. Whew... all is w--- Battery is low message. We should still make it back in a straight line THEN, what seems only a moment later it says battery is Critically Low so it's starting automatic landing... In the water! I kept overriding it and turned perpendicular to land and just went straight for the coast... WHOOPS, still on the CANADIAN SIDE! Can't land there, they won't dig that. Force it over the water and it lands on the grass JUST over on the US side, literally seconds left on battery counter. It dies moments after I pick it up from the ground about 100 yards from where I took off. Just outside a Coast Guard fenced area. WHEW!!! Heart racing the entire time!