While playing my demon hunter in act 1 inferno no matter what quest i am currently on 1 or more of my ability's will randomly reset which will cause my loss of NV stacks. I could be mid fight of a boss and all of a sudden i am missing 2 skills happened so far with all my skills at one point or another. the most recent was i was kiting a pack of rares when all of a sudden my elemental arrow and my smoke screen reset to default nothing on the buttons.