While I was autotuning my quad, at a few minutes in it shut off, crashed and rebooted. Would someone mind looking at this log to see what I am missing? I saw a high Mag field but didn’t think that would cause a reset.
https://drive.google.com/file/d/1dWfO0s8em9tc6SeNW1TyUmxdlRYkWaSY/view?usp=drivesdk
That link has an Access requirement.
Looks like thrust loss on Output 3 (Motor 2), Output 4 (Motor 1) drops to compensate and down it goes.
After determining why thrust was lost on Motor 2 (prop, motor ESC.) I would update to latest Arducopter, and then run the Alt>A initial tuning plug-in in Mission Planner. Then configure the Dynamic Notch filter, then think about running Auto Tune.
I don’t see any evidence of a reset, you might to change the title of the post. Words like “reset” and “bug” can draw a lot of attention 
Also, it looks like your thrust/weight is off. Hovering ~1625us and a learned MOT_THST_HOVER value of .608.
I changed the title, thanks. What could cause the MOT_THST_HOVER? I have only flown before less than a minute. It was at default of 0.34XXXX I believe.
On inspection Motor 3 was twitching and motor 1 will not spin at all. Mot 1 probably from the crash.
It’s learned while flying in non-manual flight modes. In your case it was from a preveous flight because here it’s steady or increasing.
Got it. Thank you sir. Lesson learned.
