shared process lanmanserver stuck?

Windows 2008 Server and lanmanserver stuck. No errors, no warnings - just only stucked process. Process kill by:
taskkill /f /pid [pid]
is not working because I can't specify subprocess - I can kill all the subprocesses. I decided to config lanmanserver with its own process by:
sc config lanmanserver type= own
after restart it is much better - process is not stucked and it is working.