EKF IMU error sporadic behavior

hey Guys.
i dont post here much (sorry for that) but ive come across an issue after changing my old faithful F550 hex from APM to PixHawk FC…
everything has gone relatively well, and the craft flies rather well, (after some failed wiring and crash) but i had this happen to me 3 different times over about an hour of flying… i can post the log of this particular flight if it helps, but im guessing this is not an uncommon thing and that someone her can counsel me on how to avoid it ,

THNX

the 2 videos are not in complete synch, but youll get the idea

I recommend you read our wiki on the vibration topics:

You have high vibration levels, which when they get worse make the EKF lose its vertical position estimate.

Thank-You Sir,
but i “believe” my Vibes where within the thresholds (well between the -+3, even less) except obviously when the incident occurs they are vibrating like mad…
i cant seem to attach (perhaps not enough posts?) or id attach the log…
i will look it over again, and admit i am no pro at reviewing them… i will reduce the sensitivity for EKF for my next flight and test (that looks like an option too)…
Thanks again :wink: