Need help to diagnosis quad fall down

ArduCopter Copter 3.5
1

Need someone to help me diagnosis my quad, I can’t find out why it spin down, I guess ESC sync issue.

Quad 600
pixhack FC with arducopter v3.5.5
15" CF prop.
sunnysky v3508 380KV
hobbywing Platinum 30A ESC with Blheli 14.9

Log file attached, thank

https://drive.google.com/open?id=1vaxo5YFAZd8GgwJEbvcOSSsv4j3fF3l1

2

Failure of motor 2.No chance after that with a quad.

Either a de-sync,a motor fault,or a bad connction (I hate bullet connectors).

motorfail
motorfail.png1920×571 21.9 KB

3

@Jagger thank very much for your time to analysis my log file , I am going to replace platinum 30A ESC with Xrotor 40A, hope the replacement will remove the problem.

4

I should have added ESC failure to that list.It’s one of those tricky to trace ones.All my problems went away once I started soldering everything that used to have bullet connectors.