I saw a couple forum posts on the wow forums about a similar issue, but no actual information. I set my gateway on immerseus HC so players can swap to the other side for add phases, but it keeps disappearing randomly. I am standing within 10 yards of the green gate, it makes no sense. One idea was that adds or puddles were damaging and killing it, but Garrosh throws desecrated weapons directly onto the gateway in his encounter, as well as spews whirl damage everywhere, yet they remain intact (obviously after heart phase i have to recast it though). Is this a known bug that anyone can offer some insight on?