i have a slightly different, but same type of issue, my rx590 works fine until i start to play some games, for example, r6 siege. my gpu works fine there, but it doesnt drop frequency after i close the game, it still says that im using 100% of my gpu though im not. i tried to reinstall my drivers and that helped, but after i restarted my pc theres a same problem. i guess that might be a driver issue, but im gonna also check if i have some kind of virus, idk. note: ive got 2 monitors, first is 1920x1080 144hz, second is 1600x900 60hz, mboard is plexhd x79 turbo v1.03, cpu is xeon e5-2689