Thanks for the response. I thought that was some sort of Bixby teaser help screen, but now I get that it is actually Bixby (obviously I never use Bixby...). So, you got me thinking. Maybe I am accidental pressing the Bixby button when I unlock (I do not use a case). So I started unlocking all day without any appendage near the dreaded button. No luck, still getting Bixby popping up randomly when I unlock about 70% of the time. Maybe a faulty phone? I am going to call Samsung today.
BTW, bxActions works - sort of. If I leave the bxActions settings at default, Google Assistant comes up in a similar random manner as Bixby did. If I choose no action for the Bixby button, Bixby still comes up randomly but quickly disappears. A fix of sorts, but something still isn’t right.