Only been noticing these very recently and I haven't found out a cause. It seems to be that when the game's audio file for the GSO fans end there is a pop of static. But it's not always, most common on an anchored AI tech with fans (so it's twisting back and forth and I think when it changes rotation direction it happens then). I only noticed it today because I had my game volume quite high and was wearing headphones. It's not totally audible over speakers (and can be mistaken for other in game sounds). Been trying to catch it with OBS since I realised it was an unintended sound just been watching the playback and was beginning to think I was going mad but have found some in a clip which I will upload later today (it's 4am and I need sleep), if there is any need for such a video (I cannot easily edit it so it's just a random clip with hopefully a time stamp of the correct time).