Copter flipped in stabilize for no apparent reason

Log Analysis -- deprecated Copter Logs -- deprecated
1

Hello!

I’m trying to make a small 230 mm quadcopter fly with an mini APM v3.1 from Banggood, running APM:copter 3.2.1.
I struggled to reduce the vibration levels and now I ended having a very decent behavior in stabilize mode.

But yesterday I was out to do some tests, and when I wanted to land, and during the (slow) the copter flipped upside down at 1 m height. No damage but I’m surprised it happened this way.

I join the .log and .bin (cannot figure out which one is useful). The flip occurred at the very end of the flight. Any clue of what could cause it?

2

Ho, forget it! I went flying today and one motor did not spin normally. One of the motor wires soldering was broken. Problem solved!