I've noticed on several occasions that I lose the 5 stack of the debuff even though I was attacking the boss, facing him the whole time. This has happened most regularly on Putricide but happened again today on Archavon my logs show that I am hitting the boss with melee swings but for some reason the stacks drop.
I was wondering if anyone else was getting this happen and how they fixed it or if they are just dealing with it.