This sounds hauntingly familiar... I have a system with a heavy
mail load, 2 ethernets, virtual servers, web servers... and if I
didn't have it autoreboot every 12 hours it would go into death
by thrashing about every 24 hours. One other person contacted me
a couple weeks ago to say they'd seen a similar problem, but
neither of us had anything hard to go on... other than the
lock up.