Please someone have a solution. I recently updated from Catalina to Big Sur on my Mid Year 2017 MacBook Pro 2.9GHZ, 16mg, 1tb. Everything seemed to run smooth for the installation. Now my screen shakes and is blurry. It comes and goes on a regular basis. Sometimes only for a few seconds, minutes, or hours. Restaring, sleeping, changing resolution, reinstalling via internet recovery (twice), repairing HD permissions, cleaning cache, does nothing. Never had an issue with Catalina or older OS. I did figure out that an external monitor connected via HDMI/USB-C works great. When the Retina display on the MacBook starts shaking blurry, the external is fine with no issues what so ever. I ran TechTool LCD, video ram, ram, CPU, etc. diagnosis with the screen blurry and everything passes fine. Attached is a pic of the screen blurry. It looks like I'm seeing double vision. There is no flicking of lights or anything, just flickering back and forth from clear crisp screen to double vision blurry. Any advice would be greatly appreciated. Also I just noticed Airdrop is not working from my iPhone to my MacBook.