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Why is "A member was removed from a security-enabled local group." being removed

Last Modified: 2012-05-11
I am seeing this Security event periodically.  It is removing a domain account from the local admin for a specific windows 2008 R2 server.
Some Admin group accounts are being removed and readded programatically.
Some are being removed and not readded.  Why is this occuring?
Where do I look?
It is causing my ADRMS services to not work.

A member was removed from a security-enabled local group.

      Security ID:            SYSTEM
      Account Name:            0NH1C8P02$
      Account Domain:            MYCOMPANY
      Logon ID:            0x3e7

      Security ID:            MYCOMPANY\_adrmsadmin
      Account Name:            -

      Security ID:            BUILTIN\Administrators
      Group Name:            Administrators
      Group Domain:            Builtin

Additional Information:
      Privileges:            -
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