abnormal operation of httpd

[Nabin Limbu]

Hi 

I'm using httpd-2.0.40-21.9 in RH 9.0 for my web server. Since few days back, I find 
my webserver responding very slowly. When using top command, I find httpd being run 
with CPU usage 98%. If left, this persists for a very long time. When I restart httpd then 
everything goes to normal. This problem re-occurs after 1-2 days again. How can I 
know why httpd service is taking so much processor time and memory?

Regards
Nabin Limbu