We know it isn't a code issue because we had no deaths from this on our server out of clearing the event 3 times. So sure it may be a server lag issue or something but it works perfectly fine on other servers so it is unlikely a game bug unless your raid is doing something no other raid is doing. Maybe you should list your class of people and spells they are casting or other abilities they are using. Maybe you have a ton of pet classes and it is making extra lag or something. 54 people in our raid and has not happened in 3 kills for us, so try to think of what you may be doing that a normal raid that is having no issues isn't doing.