ATT pitch goes wrong and results a crash

Hello

I am flying a Funjet with a Pixfalcon FC with AMP 3.5. 

Today I wanted just to try another prop on my Funjet. I launched in FBWA with pitch per switch/mixer to 20º. I gave full throttle and throwed. He climbed in 20° as usually but then takes the nose suddenly down after four seconds until he ends up in the -60 ° angle and crashes with 140km/h in the field... All FBWA.

 

Now I am in root-cause analysis and note that under AHR2/pitch real values appear as ATT/pitch shows nonsense. Unfortunately he's going probably to ATT...

Actually should the values be surely equal? What they were on all previous flights. What is the difference? What is the cause of this drifting apart?

 

I add a screenshot, log, and a picture of the debris...

 

At 23 sec I throw the plane, there's a strange slump at desired pitch (which does not come from the RC TX) at 28 sec, which apparently brought the EKF out of step on the resulting high Z acceleration. At 34 sec, the Funjet dismantled on the ground.

 

Unfortunately, in the short seconds down to the field I did not have the idea to switch to manual...

 

Can you give me an explanation?

 

Best regards

Peter

2016-03-30 19-23-16.log

IMG_20160330_200534.jpg

2016-03-30.png

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