AMD(TM) GRAPHICS YOUR SYSTEM HAS LEES THAN THE MINIMUN REQUIRED GPU MEMORY PERFORMANCE MAY BE REDUCED

It´s a known issue and ​@Amy the Stuv from Adobe replied here: 

>was working fine last week

What has changed?

If Windows, has the operating system done an update?

Has your Premiere done an update?

Do not count on Windows to be fully up to date when it comes to device drivers
Go to the vendor site to be sure you have an updated driver for your graphic adapter
There have also been reports in the past that the latest driver is not the best driver
.
Also check (copied link) https://www.tomshardware.com/reviews/gpu-hierarchy,4388.html

https://helpx.adobe.com/premiere-pro/kb/gpu-and-gpu-driver-requirements-for-premiere-pro.html

AMD/ATI Driver https://www.amd.com/en/support