Warlock Champ Skill

After using Rage Sublimation ( elite skill 60) to activate willpower blade and willpower construct sometimes it works and sometimes not. Even it is not in combat you can activated it but sometimes it doesn't works. Kindly Check please thanks

I could say that there is no bugged when in combat . But how could you explain the one not in combat? Sometimes it works and sometimes its not using rage sublimation . Thanks