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Adding multiple servers behind the LB creates the issue

I have tomcat service with 4 servers behind the LB. All of sudden the service started failing one by one and now I have only one server behind the LB serving my production requests (Like activating an user to a portal). If I add the second server, tomcat service looks fine but the user activation started failing.

Dependency services are running fine and connectivity check also looks good. Tried adding all other 3 servers one by one behind the LB but still the user activation is failing. But the user activation is happening when we have one server behind the LB.

System activity looks good and the services are running fine.

What could be the issue?