So, I have looked in the forums to see if this is happening to anyone else, but I only found one other mention, tied to kiting.
At random, a mob I am fighting, on any of my toons, in any zone, will go Invulnerable, and attempt to reset. The mob still has aggro on me, and will attack me after a few seconds. Sometimes I can kill it then, but very often it will attempt to reset in this way several times before I can actually kill it.
Now I have noticed, this happens mostly in the water, but I have run into it on several occasions on land, in a cave.
I really don’t mind the leveling in this game, but with this type of thing happening, it becomes frustrating.
Anyone else have this issue?