The last two weeks my guild has noticed a weird problem on 25 man razorscale. During phase 2 (after razor has landed), our tanks alternate taunting off of each other in order to prevent debuff stacking. However on several recent occasions this taunt has failed, not due to a resist but rather because the boss was immune to taunt.
At first I thought this was a mistake, but now 3 of our tanks have reported this problem. In most of these cases, the taunt has worked on the 2nd or 3rd try, but in a couple of cases the tank has died because he has reached 4-5 stacks (80-100% armor reduction) before anyone could get a taunt to work.
Anyone else seen this problem? Is it a known issue? Is there a trick to prevent it?
Thanks