I've had this problem since today's server reboot. Seems to be linked to respawning. Not sure. All I know is sometimes I can use it fine, and sometimes it just gives me an error tone and no ace. Anyone else having this issue?
I've seen it too. I think you can only deploy so many turrets/boxes in a certain amount of time or it goes on cooldown or something. But I've never seen any indicators to let me know when I can use it again, it just all of a sudden starts working.