I'm "stressing" the server right now, trying to weed out any hardware related issues (Since I'm aware that the server is a little bit on the cheap-skate-end of things).
It might be that the server runs out of physical memory and there's no memory containment features yet?
I mean, a memory leak would appear differently in my world.
And as of now I'm at 3.1/3.9 gigs of ram being used up by Avorion, and I bet it will hang in a little while if i keep it running this "hot".
I'll get back to you on this.
Edit: The stress-test used up as much RAM as possible, but never hung up on me. Appears to be some mechanisms to prevent that from happening. Did skip a frame or two, that's rpobably what that is. Still not sure what caused the hangup.