Apache stops processing HTTP requests, even on localhost for some reason

Not sure what is going on here, but Apache.exe seems to stop
processing HTTP requests on typical high load days (mondays to
thursdays) on our production websites.

We found that when this happens, the clients see that there are
missing JPGs and gifs, and we can see the same thing if we directly
hit the web server. Then, if we go onto the server directly and try to
load up the http://localhost we would typically see the Apache splash
page, but it does not come up.

We turn on task manager, and look for any processes that maybe running
but did not find anything.

We restarted Apache service, and that still did not resolve the issue.

We have to end up rebooting the server all together just to get it up
and running.

We are running Windows 2003 RC 2 with Apache 2.0.59 in Windows.

Any ideas?
Thanks
Wilson