While looking for the latest and greatest drivers for my video card (I did have the latest WHQL drivers), I came across this "known issues" in the release notes of the latest "optional drivers" (20.4.2)....

Using Edge™ web browser to playback video content with a multi display system configuration may cause a system hang or crash after extended periods of use.
That's pretty much the issue I had with the WHQL (20.2.2) drivers (though no multi-display system)

In the "Fixed" section we have this...
A system crash or hang may be experienced when using Edge browser to play Netflix™ content.
Seems AMD GPU's have a problem with Edge (of any flavor)