Like I told you in discord, change the Enforce Skill GCDs option in Options Editor.

I play mage and staff is the only thing we have if we solo pk, putting a cooldown even if it's a short cool down is one of the dumbest things I've seen, I dont recall any other server having a cool down. If you wanna nerf the dmg fine, if you wanna nerf the novas great. Do not put cool down on skills that don't usually have them. Just completely fucks with people's combos 

it will be fixed on next restart.

@OsmanAmca ?

@OsmanAmca was this ever fixed? does it still happen? edit: can you mention any of your steps? did you complete the caitharos quest again? did you register a symbol again?