Honestly I’ve been through the issue countless times. It’s a driver issue with the w5700x after a lengthy battle with apple, and AMD confirming it was a driver issue after refusing a warranty claim, I got my money back. Apple have no intention of fixing it. I swapped to the Vega. Zero issue since paying for a more powerful card. It’s a 7,1 issue. Doing this with a different system doesn’t help at all. This issue is specific to this setup. Interestingly I was told some systems that have shipped with the w5700x haven’t displayed the issue. I can’t validate that, but I can tell you from my experience it’s the drivers.