Cannot switch to offboard with mavros

Hi Guys, my quadrotor of PX4 suddenly cannot switch to offboard as it could before.

I am using a Vicon system to provide pose estimation by publishing to mavros/vision_pose/pose. However, it just says Switching to Offboard is currently not available. without any more information.

The platform’s information is listed below

  • PX4 v1.12.3
  • Pixhawek 5x
  • Rapsberry pi 4B

The log is https://review.px4.io/plot_app?log=cdd1df5b-2512-4864-ab43-cf3d5511df9e.

Any help would be appreciated and Thanks in advance.