5 way battle disconnect bug. Everytime we ran into a specific boss

I had someone try to run a 5 way battle with me and every time he went to the bottom left area, he would disconnect (I was resetting in the center). Once he came back in the instance, he would go counter clockwise and once he got in range of that boss, he disconnected again. Over and over. That boss must have moved because as soon as I saw it, I disconnected instantly as well. 5 way emblems ALL LOST, incredibly frustrating and infuriating.

I have only made enough sets to make 3 5 emblem fights all month. Both I never had a single problem, this third one it was completely lost. The other person never had that happen either. Something this game breaking, should not be happening a month in. I am hesitant to try another for fear of this issue again. I hope you guys can narrow this down.

Report #547,145,496. I couldn't get the report inside the instance since all the portals are gone, but maybe it will help.