Queue timing out after changing MONQ setting to Medium

Document ID : KB000124212
Last Modified Date : 08/01/2019
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Trying see the Oldest Message Age Metrics for some of Queues

Setting the parameter at Queue Manager Level by configuring the Online Monitoring=Medium

With this parameter enabled, we are able to see the Oldest Message Blame Point Metrics. The problem is when changing the parameter to medium, it would revert back after 5 minutes. It almost looked like APM is resetting it after the 5 minute run.
APM 10.7
An MQ environment/configuration issue. 
APM Monitoring does not impact MQ settings. So the root cause lies elsewhere in the MQ environment