Remote Function Calls (RFC) for Serialization data between Panda and ATTP are intermittently failing.
AWS recommended upsizing the instance type for the P23 application instances (Case ID: 176962192200479). 
 
https://support.console.aws.amazon.com/support/home?region=us-east-1#/case/?displayId=176962192200479&language=en 
 
Following approved downtime for P23, we successfully upsized the application server instance types under Change ID CHG000011359107. The Korea business site was informed after the implementation was completed. 
 
No issues reported since the instance type has occurred. Hence proceeding with closure of the incident. 