Roll estimator failed during the drone was in air

PX4 Autopilot
1

Hi, I am using tarot 680b and pixhawk 6c 1.15.4 and I executed 2 times of pid auto tune and it went well and smoothly landed.

But when i was trying one more flight, the px4 showed attitude failure(roll) during the drone was in air. And it crashed. I saw a log and I noticed that roll estimator abnormally fluctuated when drone was in air. Can you figure why the attitude estimator failed?

my guesses are:

  1. the battery voltage was too low so, it may affected the estimator
  2. dataman low on stack sign → i thought it was ignorable. is it critical warning message?
  3. Avionics power low → it always displays though in normal flight. so I ignored it. was it blamable?

I attached a flight review link. Thanks. Flight Review - Quadrotor