Y6 tilting backwards ... and crash

Hey guys,

now and then my Y6 (custom build) shows an extremely bad behavior.

It is suddenly tilting backwards, mostly to recover in a glimpse, but then sometimes it is not....

I did a lot of testing, changing motors and escs. but 'til now I was not able to identify the problem.

So it is time to ask the pros.

My setup is:

RC: Futaba TX: T10CG, RX: R617 FS

Motors: RCTimer 2212/1000

ESC: RCTimer 20A SimonK

FC: APM 2.6, latest Firmware

GPS: Ublox Lea

PDB: 3DR Hexa

Data: 3DR Radio

FPV: Mobius to MInimOSD to Fatshark TX

3691138087?profile=original

I uploaded a video from todays crash to Youtube

http://youtu.be/sCWMsNX6hz0

where you can see and hear what is happening.

Fortunately nothing was severely damaged.

But a month ago I crashed from 60 m with heavy damaged to my copter.

I will also upload the log file from today.

I really hope you can make something out of it.

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