Copter flips after ESC replacement

ArduCopter Copter 3.5
1

After a heat mishap with my old ESCs, I got 4 of these: https://www.heli-nation.com/dys-xsd20a-speed-controller-20a-blheli-s-firmware-dshot-4-esc-combo

After replacing everything, everything seems fine. ESC calibration runs well, and I take off in altHold. First flight I have no problem. Second Flight I run autotune until battery dies, everthing is fine otherwise. Third flight, I fly for about 30 seconds to a minute, and suddenly the copter flips violently into the ground.

Every filght since does the same.

Studing some logs tells me that motor 4 is getting max signal at the time of crash, and motor 3 minimum.

Attaching some logs, would love some input!47 2000-01-02 05-50-28.bin (199.1 KB)
46 2000-01-02 05-32-22.bin (705.1 KB)
52 2000-01-02 07-15-24.bin (439.4 KB)
45 2000-01-02 05-12-06.bin (1.6 MB)
45 is the successful flight, the others are the crashes.

2

As you saw, as it flips to the right, and pitches up, the right rear motor (4) is commanded to max - it does not help.
that means you have a problem with anything after PWM output to #4 , signal wire, ESC, motor wires/motor , propeller … etc.

check for broken leads into motor,or something that could have a periodic fault.

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