Security plugin not responding on time

HI Team,
I was successful in setting up my production instance , which consists of 3 masters, 2 data's and 1 client and setup was working as expected for quite some time now, However, I am getting strnge page response on my kibana screen, which says the my client node machine status is RED and heap is around 1.4 GB, It also shows that the security plugin is not responding within 3000ms

I tried increasing the heap memory of all elastic nodes to 4GB, but i still get the same error response and it is constantly showing 1.4GB heap memory. It is also failing the security authentication regularly.

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