Lose of control beacose lose of "Desired Pitch"

I am trying to build a 250 fpv racer:

After performing the main configuration and during the second flight I had a suden lose of control:

Looking at the data flash logs, I fond that the desired pitch suddenly goes to cero:
It is probably due to an exceed of vibrations:


can someone confirm this, or point me to the right direction?

Thanks in advance