ENDIAN Firewall - issue with 2.4.1

Ive been having an issue with 2.4.1 for quite a while now, that initialy looked like a HW issue.

after about 48-72 hours the disk light on the box is hard on.

no response from the network , and although the menu is still displayed on the console, selecting
any of the options ie reboot gives /sbin/reboot not found.

Now ive replaced the system completely now, with the exception of the plugin network cards.

I had also run with an alternative disk for a few days , just in case that was faulty, and that did the same thing.

after several of these 48-72 hour periods of lock up/freeze of the disk IO the disk becomes corrupt beyond recovery and a re-install

and re-apply of the rules restores operation.

systems running now on a newer version of the jetway atom board that it originality ran on, but it still does it.

I cant move to 2.5.1 until ive resolved the issue with interzone dns that gets broken as soon as i upgrade, with same rule set.

Any ideas.

regards peter