I actually started experiencing that problem today (AIX). I went and did a topas and mvstat command, and my resources were ok, so I don't know what made the console lock up. I did notice that in a couple occassions that event server had stopped running, and had to started a couple of times. I didn't check with the network people to check the health of the network. I'm curious to know if anyone has experience this as well, and if they have found the cause.
Thanks,