I have also noticed this same behavior often viewing Necro Reapers, or using any of my Necro abilities. Particularly bad in any combat though watching someone in combat also causes crashes. In particular Necro skill Frozen Abyss, in Caledon Forest underwater. Any combat in Dry Top is very harsh. As well as the LNY event area absolute crash guarantee. Crashes in WVW given any combat. Sent in 90 logs so far lol. I WILL get my dailies done as well as the cursed LNY events...