Aspen CIM IO OPC server memory leakage


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We have Aspen CIM IO server running for last 6 years. It uses Yokogawa EXAOPC to read DCS data. Recently we observerd a memory usage problem for the Asyncdlgp.exe process. The machine ran out of memory and had to be rebooted. The memory usage is increasing again everyday after the reboot.

Can't understand what could have gone wrong recently. We never had any issue for last 6 years. Has anyone faced such problem?