F5 health monitors intermittently failing.

Hi All,

I am facing a wired issue with some (say 2 F5) different environment. Issue is pool is going intermittently flapping due to health monitoring (icmp, tcp & udp) failing  with error "No successful responses received before deadline." Both F5 environment are running on version - 17.5.1.3 

One interesting thing observed was that one F5 environment this health monitoring failing was observed on standby F5, while there were no issues observed on active F5. Please let me know what can be the actual cause of this issue & how to resolve this.