Just checking that if you have the AMD experience installed you have tried to disable all of the AMD software stuff. I had a couple of problems when it was enabled, not a single one since I stopped using these.
Click Radeon software in system tray>Gaming>Graphics
Make sure all that stuff is set to disabled, test and report back.
The other one to try would be rolling back to an older GPU driver version. If youre mainly playing CSGO there could be something in the newer driver that stops it working as well in that one game.