I am having the same problem as this thread http://social.microsoft.com/Forums/en-US/whsvailbeta/thread/1ba632c7-e830-443c-a43e-c1c75b7dcaab but
the fix there hasn't helped me.
The Windows Server Health Service and the Windows Server Domain Name Management keep terminating unexpectedly, especially when I manually refresh the WHS Health Status Alerts, the error "Unable to collect alerts" pops up and the service goes down.
I am running the full retail WHS 2011.
www.lewiscobley.co.uk/asp