EKF Failsafe mystery


I was flying above the field where i usually fly, and suddenly EKF failsafe was triggered. unfortunatelly i am unable to find in my logs specific parameter which trigered this failsafe. Is anyone able to help me? (happened also in flight right after this one). What is wrong?2019-08-08 15-24-14.bin (2.7 MB)
2019-08-08 15-24-14.bin (2.7 MB)