To sort out the problem of the master station and back up station frequently losing their connection, you can try the following solutions:
1. Check the network cables and connections to ensure they are secure and not damaged.
2. Restart the network devices (routers, switches, etc.) to see if that resolves the issue.
3. Update the firmware of the network devices to the latest version.
4. Check for any interference or obstacles that may be affecting the connection between the master and back up stations.
5. Consider upgrading the network infrastructure to improve reliability and stability.