HanksterPar:WGT support has no answers other than "it's not them".
I'm not taking their side, but they're probably right on this one. If reinstalling the driver temporarily fixes the issue, it's likely a GPU driver or system conflict.
Try using Display Driver Uninstaller (DDU) to fully remove the driver before reinstalling the latest version.
You might also try to disable Windows automatic driver updates to prevent it from overriding your installation.