While fighting Prince of Pestilence in Mun-Tuy Cellars, If he would cast shock spikes and i would get stunned, auto attack would only continue until i used another ability, then it would completely stop. I tried using flurry, concussive blow 2, sacrifice 2, second wind 2, featherfoot 2 cure 2, and follow through. All of those would cause auto attack to stop if used after coming out of stun. I could use other abilities, but no auto attack. Each time I waited 30 seconds or longer for it to resume and it did not. The only way to get auto attack to resume was to completely put away my weapon and to re engage. I have not tested it against other mobs.