I'm having this or an extremely similar problem. Seemed to only start happening this week, I've had DCS/FC3 for about a month, and had DCS World with just the A10a for a few years and never experienced it before recently. I get a momentary sound interruption/buzz sound with an accompanying micro stutter. It seemed to always go away after a reboot, but then started happening more and more, and reboots stopped fixing it. It even happens in the menu before I start a game, i hear the menu music being interrupted by this little static sound. When playing multiplayer with SRS installed it got to where it sounded like someone was clicking the mic over and over, but I quit it and it kept happening... so strange, extremely frustrating issue. I tried setting my GPU to "MSI mode" via some other thread I saw on this issue which I thought fixed it after the required reboot, but then the next night it was back worse than ever. This sucks. I also tried the standalone DCS instead of steam, same issue occurred. It happens less in single player seemingly but still quite annoying. Asus MB, Ryzen 5 3600x, 16gb, Gb 2060Super, Win 10.