The seg fault errors have been a plague since the very beginning. If you're running a ded server version prior to 1.02c, then you are open to the same crash vulnerability that existed in Q3 1.29f/g and someone could be intentionally crashing your server. However, even with 1.02c there's still plenty of seg faults to go around. The best thing to do is have an auto-restart script of some kind running to restart the server when it crashes. Mine crashes at least 1-2 times a day--sometimes more often.
"Do you expect me to talk?"
"No, Mr. Bond, I expect you to DIE."