Nexus Turret Sound Glitch

I've encountered this quite a few times so it might have been reported already but it's happened before a few patches ago, happens in this one as well, so bringing it up myself just in case.

The nexus turret/turrets sometimes sound as if they're firing at something, with nothing being there at all. Not 100% sure what causes this as sometimes it does this without even firing once during the course of the game. It's not game breaking, but it's really annoying.