Was using a mana turret inside one of the tech plants on Amerish(the one located in the south, near the TR gate). Was set up at the top of the stairs in front of the generator overlooking the capture point. Everything was working fine until an enemy engineer managed to get past me. I jumped off my turret and finish him off. However, an enemy medic pops around the corner and finishes me off. I get resed after the enemy was cleaned out again and jumped back into my turret. The enemy start pushing the stairs at the far end of the room so I line up my cross hairs and pull the trigger. Only now, my turret is having graphical splash directly out of the barrel... as if I am firing directly into a wall. No bullets come out so I am forced to abandon the turret since it is now unusable.
