Windows Server 2012 – Scheduled Task – Multiple Instance Spawned

  scheduled-tasks, windows, windows-server-2012

I have set up a scheduled task on a server that is running Windows Server 2012 R2. The task contains a trigger that is configured to execute every 5 minutes. The action is to launch a PowerShell script which is a business process that is responsible for invoking a system center orchestration HTTP service to launch a runbook.

I am seeing some data being duplicated and upon investigation, the root cause of this is down to multiple instances of the scheduled task being invoked at the exact same time.

I have checked to make sure that all server patches are up to date, and i have also tried to delete the task and rebuild it. This does fix it for a period of time and then it comes back.

I also read online that this can be caused by importing the scheduled task XML, however, as stated above I have deleted and re-created the task and it still happens.

I have provided screenshots of the scheduled task configuration below.

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Schedule Config
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The task completes fairly quickly, and this is normal behavior.

Here is an image that shows the scheduled task triggering multiple instances at the same time.

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Is anybody aware of a problem in the task scheduler, and do they know of a solution to prevent multiple instances from spawning at the same time?

Source: Windows Questions