If a Win2k8 R2 server should experience an alert from SCOM that the SMS Agent Host (e.g. the client) service is running, then the resolution is to simply restart the server. It is possible to prevent this on new server builds – Microsoft claims that restarting the server after installation of the SCCM client will keep the issue from occurring.
This alert is generated because the client crashes and then does a self-reinstall to recover from the error. You can confirm the client is crashing by checking for application event ID 1000 and 1001 for ccmexec.exe or system log event 7031. Microsoft has confirmed this is a recently discovered issue with SCCM 2007 clients on R2 servers and that the information is currently only published internally. The root cause is that Microsoft has found a problem in the code, but it is only fixed in SCCM 2011 and won’t be for SCCM 2007.
John Nelson may have isolated the cause of the client crash, attributing it to execution of the Resource Monitor. Check out his post at http://myitforum.com/cs2/blogs/jnelson/archive/2011/08/17/158887.aspx
Now there is a hotfix available! See http://support.microsoft.com/kb/2724939/en-us