Have the same problem, got bashed by my party after Dzemael last boss ( and the 2nd one ) even though I tried to explain them... I 'm not doing this dungeon anymore and I'm afraid to discover the next ones.
AOE that are randomly cast can be avoided, but when you are targeted by the mob, you can't escape it.

Another thread about this :

http://forum.square-enix.com/ffxiv/t...s-everybody%29