Httpd dies and WHM doesn't know about it

My httpd has been dying periodically recently and WHM doesn't seem to see it at all, and thus apache isn't being automatically restarted. I see the following in my error_log right before it dies. This problem is huge for me because clients get mad that their sites go down often and yet I don't know about it and WHM doesn't restart it either. Help?


[Thu May 23 09:03:15 2002] [error] [client 210.159.146.77] File does not exist: /home/members/public_html/suspended.page/
[Thu May 23 09:03:15 2002] [error] [client 210.159.146.77] File does not exist: /home/members/public_html/404.shtml
httpd: module &mod_log_bytes.c& could not be loaded, because the dynamic
module limit was reached. Please increase DYNAMIC_MODULE_LIMIT and recompile.
Zend Optimizer requires Zend Engine API version 20001224.
The Zend Engine API version 20010710 which is installed, is newer.
Contact Zend Technologies at http://www.zend.com/ for a later version of Zend Optimizer.

[Thu May 23 12:00:42 2002] [error] Cannot remove module mod_log_bytes.c: not found in module list
[Thu May 23 12:00:42 2002] [error] Cannot remove module mod_perl.c: not found in module list
[Thu May 23 12:00:42 2002] [error] Cannot remove module mod_php4.c: not found in module list