So...I've had a couple not-so-fun instances with both an APM 2.6 and a Pixhawk where it seems to invert the horizon and crater dramatically into the ground at full throttle. I've attached the log from the Pixhawk flight. I have a sneaking suspicion that bad vibes are the culprit (had a minor mishap that may have created an unbalanced prop situation), but it doesn't completely make sense that it would cause this response.
The APM flight happened a couple years back and demolished everything...well not everything I had a couple screws left. That one was interesting. I flew in manual and loiter modes for about 45 minutes before deciding to set up a mission. Took off in loiter mode, flipped to auto, it took off away from the waypoint, slowly flipped until it was facing straight down and spooled up the motors to full throttle until it hit the ground doing Mach 10. Pretty sure it may have hit the speed of light as some parts vaporized or were transported to another dimension. This doesn't really help without the flight logs, but thought it would be interesting, especially in light of recent Solo mishaps. We have come a long ways, but gravity seems to win a lot of the time...or really the sudden lack of motion.