This has been an issue for some tanks for a while.

I get harassed a lot to "learn my class" and I stand there speechless when I am spamming enmity moves at a single target or spamming a mob (yes even flash , etc) and I lose enmity. whats even worse is that there seems to be a move that either is BARD specific (or possible shadow move from archers) which removes my ability to target an enemy for several seconds. As in the red circle on the ground disappears and it can take up to 15 seconds for me to be able to target again. I used to think it was a glitch with my character only, but I have had other warriors and gladiators argue with archer/bards in dungeons that they are removing enmity and or targeting abilities from them while that archer/bard/lancer screamed at us to "learn your class".

I think this is a random glitch in the game as it does not happen all the time.