So I took my new Phantom 3 Professional out to the beach this weekend to get some nice beach and water video footage. I had my battery fully charged and ready to go. When I got to my take off point I made sure and calibrated it and got the Safe to Fly With GPS, so I took off and flew it up and down the beach a few times, 10 minutes into my flight, I had looked and it said 51% battery so since I was flying over water I was being extra careful and wanted to get back before I got under 30% just to be safe, all of a sudden a red signal flashed across the screen "Critically low voltage, the aircraft will land now" I was still about 500 yards or so offshore and maybe a quarter mile down the beach heading back when it said this I immediately started to try to make it back, my FPV went out so I hit the return home button the controller started beeping as if it was working but no Phantom in sight, my stomach dropped and I waited and waited... no Phantom 3 professional returned... So I checked my flight log and it seemed that the battery went from over half charged to nothing in a matter of seconds and went into the water. Has anyone had this type of experience? You can see it went down seconds after the critical low voltage warning, I was being so careful to do EVERYTHING by the book as well. I emailed DJI, we will see what they do for me but I am still sick, I have only had this a few weeks and was feeling very confident about flying it safely. See my attached image of the last screenshot captured.