Neoload Load generator Issue

Hi,
I usually face issue with Neoload Load Generator availability.Even though it is available at the point of time ,it may throw errror like "Load Generators are unavailable". This issue comes while running the test in jenkins as well. And in next 2 -3 try ,i usually able to run the test. I think if i see the green status of LGs in neoload controller, it means it is available.

Please let me know what else i have to check before running the test so that i can avoid the error.