We recently upgraded our AIX version from 7.1 to 7.3 
On this server we are running ACE v11 fp 15 with IBM MQ v 9.2 fp 10
One of our Integration Servers as of the day of the upgrade has started using more and more memory/paging space which causes our server to start having memory/paging space issues every 7-8 days. To prevent the LPAR from crashing we stop and start the Integration Server.
This particular IS is pretty straight-forward in that the message flow in question reads messages from a queue and inserts/updates rows into an SQL Server database table(s) using an ODBC connection.
Any ideas on may be causing such an issue. Regads