As I've been grinding dolmens in order to help level skill lines, I have noticed that my Expansive Frost Cloak will bug and prevent me from being able to successfully cast or refresh the buff after a while of not switching bars. To begin with, I was able to switch bars and cast a skill to fix it. Then it became two and then three skills. Unfortuntely, it seems to have gotten to where this isn't fixing the issue either. I have not noticed this except for when I drop back into healing and not swapping bars as constantly as when solo.