VISION_POSITION_ESTIMATE message stops publishing data on MAVLink after certain interval

A ZED stereo camera is connected to NVIDIA Jetson Xavier. A python script, running on Jetson Xavier is calculating the displacement of camera using Visual Odometry (VO). This VO data(r, p, y, x, y, z displacement) is sent to Pixhawk(running on PX4 master firmware) using Dronekit library. When I try to see the data in Mavlink Inspector, it shows good data for some time and then 20-40 sec later, it stops showing data on Mavlink inspector. Need Help!