My application implemeted in classic ASP code and hosted in IISV6.0.

But oneday my application URL did not work. i checked event viewer error logs but no errors. And i checked event viewer system error logs. I found 2errors. That two is IIS restarted automatically. the following is the error details.
The World Wide Web Publishing Service service terminated unexpectedly and The IIS Admin Service service terminated unexpectedly.

it's happend 1 hour and after that URL works fine.

But i want to know why the iis restarted automatically with that errors.

Server is :Windows 2003 SP2

Please help me any one on this issue.