Well, since I don't host or play JJ2 online at the moment (due to an uber-firewall of, of, of FIRE!), I've not experienced any crashing myself. But it certainly does seem like more people know about crashers, and how to deal with them. I would guess that PE just by being around is making people more aware. They've apparently had some reports of crashers as well, though whether or not Nimrod and co listened to them is another matter.