Random JCO Communication Failure Error after Hardware Migration

Greetings experts,
we had a migrated our XI server to new hardware and had couple of SLD related issues which were solved by the migration team. However, we are getting JCO communication failure very frequent whenever we use JCO from JAVA to call an RFC. The weird thing, if you restarted the message it will be successful.
The error message in the message monitor :
"COMMUNICATION FAILURE" during JCo call. Error opening an RFC connection"
Any idea to solve this random issue?

Hi again,
the number of connection was increased to 200 but with no effects. Also, the user used to connect is a system user which does not need a ticket.
This is my connection code
               mConnection = JCO.createClient("600", // Client
          "USER", // Username
          "PASSWORD", // Password
          "EN", // Language
          "hostname", // Host
          "01"); // System Number
do I need to add anything else if I am using a clustered system?

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