Slow Roamio Pro?

Recently (last few months) my Roamio Pro has developed a terrible sluggishness. Whenever I select a new screen, it takes meany seconds for the screen to refresh. Often it leaves a black screen up during this time. I see no reason for this at all. As a software developer myself, I cannot imagine allowing this to persist in the software. I don't remember this happening before.

What might be going on here? Is it a bad upgrade? Something else?

-Bob