Re: Barrier not working?
I can't find anything on the internet talking about broken barrier mechanics, but there is not much discussion about it at all. No one on the EA answer forum has ever complained about barrier being buggy (in 9 pages of posts mentioning barrier).
Is it possible the spell expired and was cast again just as you were hit (you can get abilities so the cooldown = ability duration)? Does it happen all the time? Are you the caster or is another mage? What kind of damage - any or just elemental or just physical? Is the barrier still at full and your HP drop to 1 (I assume this is what you meant, just clarifying)?
Are you sure you cast it right? You have to be in the area of effect when it is cast, it doesn't just automatically cover everyone in the group with a barrier everywhere on the field. You should have a blue overlay on your health bar if barrier is active.
It could also be a special ability of some enemies. I can't think of any off the top of my head, but there are probably abilities that bypass armor/guard/barrier and hit directly at you hit points. What enemies are doing the damage when you take it?
There are many variables as you can see, so you need to provide more detail.