Quadcopter descended until it collided with the ground in auto mode

ArduCopter Copter 4.2
1

https://drive.google.com/file/d/1MFk3yWRYezui-L2e6oViroyDhUgacWub/view?usp=sharing
Here is the data flash log of my two auto flights. First one was succesful. I tried the same mission but in 4 metres again in the second flight but in the middle of it, the quad slowly crashed into the ground. I will be really thankful if you enlighten me about what I do wrong.

Note: The quadcopter is over-powered by 3:8

2

I don’t see any evidence of that with a MOT_THST_HOVER value of .523 and these outputs:

Rc output
Rc output1652×506 104 KB

Anyway it looks like Motor 2 lost thrust but it’s strange that Motor 1 didn’t drop to compensate.

Motor 2
Motor 21697×503 90.6 KB

Battery monitoring doesn’t appear to be configured right which could help.

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