Glad you found the cause of your issue!
As for a solution though, I don’t really know. From what I’ve gathered about that issue is that it is a fairly long-standing issue with the 6000-series.
You could use gamemode,[1] and set it to toggle high-mode while running a game.
But as for a real long-term solution, the best I can do is link you to the relevant bugtracker.[2]