Warning: EKF primary changed: 1 & EKF primary changed: 0

I am trying GSF in high mag field area.
I had not faced much issues with that config.
But in log data it’s showing [Warning: EKF primary changed: 1 and EKF primary changed: 0] and Yawing looks abnormal.
Please help me to get rid of this.
I am sharing log data below;
https://drive.google.com/file/d/14vFmate9vB-rUmM-xvgKlqjGI5M2jLN0/view?usp=sharing

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I also had the same issue.
Something seems to get unstable when the GPS changes.

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