Consider the following scenario:
You configure two Microsoft SharePoint Server 2010 servers as SharePoint query servers in a farm.
You create a Search service application on a SharePoint server.
One of the two SharePoint query servers is shut down.
You run the SearchServiceApplication.Pause() command in a SharePoint PowerShell window.
In this scenario, the command does not return True. Instead, the SharePoint PowerShell window stops responding.
To resolve this issue, apply the following hotfix updates:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.