First time i've seen this in a year of flying. As shown in the video around 35 seconds the heli loses power, and onboard low voltage warning comes on. ( I didn't get a telemetry response on my spektrum, buy my telemetry is crap these days) As I see it fall I crank the throttle and it responds. I have add battery failure before but when that happens the heli flips upside down and away it goes. This time it seem it was more kind of gliding down motion. Not a fun experience, especially infront of the client! The same thing happend on the flight immediately after this. The next 2.5 hours (rest of the shoot) it was fine. Has anyone experienced this or does anyone know what the issue could be? Thanks in advance!