What were you doing when the crashes happened? Was it the zone, server, or just you? Was it an LD or CTD? This is more of the info that is helpful. From what I can tell, it's not easy to check logs (though I've never run my own server).
They were definitely zone crashes. We were beating on skullcracker then the zone crashed, I figured it was b/c there were 42 people in CB so I just called it a night after the 2nd occurrence. Apparently the # of people in the zone wasn't the issue, though, hrmm..