Hi,
We've had this bug occur where after Garuda disappears during The Howling Eye (Hard). When she summon adds or teleports to do explosions, she might disappear off a players screen completely and not return until the next time she teleports so we are unable to even see her, target her, target of target or anything until she reappears. It doesn't happen to everyone at the same time just randomly for random people. I had it happen for me 3 times today.
Sorry if this has already been posted.
~ Mithrie