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.
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It's interesting you mention this. I saw very similar behavior from my own quad recently. It went fully inverted, and maintained throttle into a tree and then the ground. Just like in your situation, I've never had any issues in any mode other than auto. Here's my thread: http://diydrones.com/forum/topics/front-flip-while-mapping-crash
Fortunately I was able to get the quad flying again, but I'm more concerned about things like this happening in the future...
It sounds like you suspect a nasty bug related to recovery from inverted flight.
*if you can do 100% safely* :
- remove props, maybe even run it of a lower voltage , hold it in hand, in stabilize mode (or the one related to accident) - then invert it perfectly once it's "flying" , and see how it responds. - you will see RCOU logs indicate watch motors are at idle, and high throttle.
you expect to see some motors work on high RPM, while others to idle.
Remember to do this only if there is no risk of getting hurt.
I'll try this today and get back. I've tested each individual motor and ESC and all appears to working properly so we can rule out an ESC cutting out.
sorry - too little data in that short log to say anything about what happened.