I recently bought a new Vega 56 and there's a very weird issue that I have yet to solve. Whenever any kind of overlay comes up in-game, such as the Radeon overlay, Windows Volume(top left when you change volume), Steam overlay...you name it. The monitor will drop drasically in hertz, down to like 60 for a few second, then fix itself when the overlay is turned off. My actual fps in-game doesn't seem to change, just the monitor hertz. It also seems to only happen when in Freesync mode. Anyone ever heard of anything like this? I was on a GTX 1060 before the Vega 56 and didn't have this issue.