Out of process application '/LM/W3SVC/1/Root' terminated unexpectedly

[py1rdj]

Some times IIS stops responding after logging some warnings --- with event ID 37, source - w3svc

Out of process application '/LM/W3SVC/1/Root' terminated unexpectedly.
For additional information specific to this message please visit the Microsoft Online Support site located at:

http://www.microsoft.com/contentredirect.asp.

After restarting the service, it works fine
What is the cause & what is its solution

Sometimes IIS service doesn´t stop and I have to reboot the server.

TIA