HITL,error: GNSS data fusion stopped

Hi erverone. Recently, I am using px4 1.14 with a pixhawk 6x trying to run HITL on QGC with gazebo and have been running into issues. There are a error message that ‘GNSS data fusion stopped’ when I send the arm signal. And the yaw angle is constantly changing. I need you help. Thank!!!

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This is a prompt from QGC

_recalcFlightPathSegments homePositionValid true
_recalcFlightPathSegments homePositionValid false
_recalcFlightPathSegments homePositionValid true
HealthAndArmingChecks: Unexpected event, resetting. Expected: 0 Got: 1
HealthAndArmingChecks: Unexpected event, resetting. Expected: 0 Got: 1