Fleet Server is not healthy

Hi Team,

We have 2 fleet servers running in our cluster, and one of the fleet nodes is flapping between healthy and down, we did check all the logs but could not find any error messages(all are mostly debug logs), also checked the status of the agent which says connected all the time, can someone please let me know what could cause this issue and where exactly should I look to find any potential issues. We have ELK stack version 8.13.4.