Has anyone had a yaw input cause an immediate flip to full inverted? At this point it was about 75ft up and unrecoverable so I cut the motors to lessen the impact velocity. All damage was easily repairable. This is a 3DR hexab with v2.9 firmware. The first test flight with no yaw input went perfectly, then a friend said, "test the yaw" as soon as I put in a slight left yaw input it did a perfect roll to inverted, stopped and fell.
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Solved. Bad BEC (Hobbyking x3-6 mini BEC) caused the APM to fail resulting in spurious inputs to the motors. Removed the BEC and everything appears to work (except the GPS which was destroyed).
Do you have logs?