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The Servers for Windows process stops once each day. Usually, the service stops at midnight, whenever Windows checks for updates, or whenever the server is restarted.
This issue occurs when the SCCM 2012 health check improperly terminates the Servers for Agent process. This issue was fixed in SCCM 2012 Service Pack 1. To resolve the issue, install SCCM 2012 SP1 or higher.