Champ Coil Commander losing aggro, healing
I think this is an intended mechanic of the boss. The way you do it is to have a group of players spread out to a few locations(around 3) where they can immediately re-aggro the boss when he teleports. It is completely doable with a 5 man party. AFAIK this mechanic hasn’t changed since the launch of GW2
You need to learn the mechanics of the boss fight is all. Working as intended, just spread out.
http://www.youtube.com/user/randomfightfan/videos?view=0&flow=grid
I know how the fight works, but I used to be able to unlock this dungeon with just one other person. Many times pre-guesting I set out for a 4 a.m. PUG run where the party was not on the same server, and two of us were able to stick together and beat him. His leashing mechanic seems to have changed and, in my opinion at least, he seems bugged. There are no other teleporting boss fights in the game where losing aggro and healing to full is part of the mechanic.
He has always been like that. You need to spread out.
I know how the fight works, but I used to be able to unlock this dungeon with just one other person. Many times pre-guesting I set out for a 4 a.m. PUG run where the party was not on the same server, and two of us were able to stick together and beat him. His leashing mechanic seems to have changed and, in my opinion at least, he seems bugged. There are no other teleporting boss fights in the game where losing aggro and healing to full is part of the mechanic.
Well there is one other boss …
One of the CoE story mode boss will keep teleporting itself backwards until it leashes itself if you stand on the wrong position.