The following event is logged in the Application log on the SharePoint Server 2010 front-end Web server
when you perform a search: 
Additionally, you receive less relevant search results when you perform a search.


This issue occurs because the Search Query Logging thread reuses expired credentials.


To resolve this issue, apply this following hotfix package: 

2459257 Description of the SharePoint Server 2010 Cumulative Update Server Hotfix Package (MOSS server-package): December 31, 2010


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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