Segmentation faults (11) in error_log

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Hi,

Since a couple of days I am getting

[notice] child pid $PID exit signal Segmentation fault (11)

in my error_log.
I am running RedHat 7.3 with apache 1.3.27 with PHP 4.2.2 and mysql 4.0.15. If I start my webserver (on which I host a whole lot of busy websites.), after an hour or so I start getting segmentation faults in my error_log every minute or so. This keeps on going for hours after which the system slowly grinds to a halt.

I have temporarily 'solved' this by restarting httpd with cron every 2 hours but I need a proper solution. Has anyone ever seen this before ?

Thanks