I refurb and rebuild crashed drones. Yesterday, I bought a P4 that the owner said just lost power and dropped from the sky at about 100 ft. That's very unusual. What's more unusual is that 2 other drone flyers had the same thing happen to them on this property. He is a professional photographer and has several other drones including an Inspire 1. My impression was he is knowledgeable about drones and flying. The owner of the property had hired all these flyers to get footage but the same nasty ending seems to befall every drone. Any thoughts as to what might cause this? A preliminary assessment indicates ESC error on motors 1 and 4 which oddly enough is on the other side of the crash damage. Looks like I'll have to replace the right side ESC board.
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