persistant soundcard image on desktop. Fedora 29

[Richard Dawson]

Intermittently an image, approximately 1.5"x1.5" appears in the center of the desktop, covering whatever application is running.  The image contains a "sketch" of (presumably) a sound card and a label "Built In analog digital stereo ( IEC958)".  Sometimes the image stays on the screen for extended periods of time, and sometimes it seems to appear and then disappear.  (It of course stays there for a long time when I am trying to see what is under it in the application.)  This is a deal breaker!