Supporting Fire skill bug

Hi,

i'm trying to play a tactician minion build, i have 2 auras: blink and overwhelming presence, i have 8 spectres and 1 cleric.

Sometimes i can't use my supporting fire minion skill from my ascendancy, i have mana, i already used it at the begening of the map, but after sometimes on the map or when i trigger something (idk what) it won't work anymore i need to tp out and use the wheel when the cooldown of supporting fire is finish i can't press it anymore.