Nexus Turret Bug

So I've had this bug happen where the Nexus turrets start making noise as if they're shooting, and then they don't stop until the game ends. I'm trying to think of what triggered it, but nothing is coming to mind (although maybe with a replay system I'd be able to review it and put some hypotheses together, but I digress). Perhaps it might be linked to the changes in turret operation? Might be worth looking into the code for them.