I haven't noticed any particular event associated with it. It is usually preceded by a slight lag. I thought that perhaps it had something to do with continued use of the game combined with particularly intense sequences. I've just completed a slight fix to the Hecate MK2 in my tables (see bp2-06 thread), and I was getting an error message during load for that ship that I chose to ignore. Maybe it will work now. The error message associated with this crash however references hud.cpp, so maybe its due to something else. Time will tell.
Something else I noticed, not associated with the crash. I often fly a Nyx in this mission, and I noticed that if I am the first to call for a rearm, I get a Hygeia, which can't fix my hull. The only way to solve this as far as I can tell, is to create "#UEF" versions of each ship you might be able to fly so they call a UEF support ship. I know that it's hardly a mission-breaking bug, but it is a bit inconvenient. Maybe there's another way to get around that... but its not very serious, so don't give it much concern.