I've also noticed it happening with biter death sounds and other biter noises too, but it's mainly the flamethrower turrets (probably because I use a lot of them on my perimeter walls), when they go active.

I've been having the same issue. See my post: viewtopic.php?f=7&t=96343. For me it's been with Flamethrower turrets mainly.

With 1.1.25, the sound effects of Flamethrower Turrets firing seem to not be fading with distance when not in the Map View. When outside of Map View, if flamethrower turrets begin firing at Biter enemies anywhere in the factory, wherever I am I hear faint overlapping sound effects from them. The sou...