Question about rebooting server

[Dragoncrest]

	Hi all.  Got an older box running Fbsd v4.6 and for some silly reason it's 
got this strange habit of giving an error (didn't stay up long enough to 
write it down) that sounds like a kernel panic, except instead of the 
typical kernel panic message, it fills the screen with some message about 
an application error, hit any key or the server will reboot in 15 
seconds.  It only does this when compiling or after the box has been up for 
more than 24 hours.  It's not a mission critical machine, but it's got some 
data on it I'd prefer not to loose.  I know I'm being kinda vague, but it 
happens at random and I usually see the error on the screen just before the 
box reboots.  So I don't have time to catch it.  I'm sure someone has had 
this before.  This is also the same box that had the ports installation 
issue.  Any insight into this would be welcome.  Also, if I see the error 
again, I'll try to write it down.