I ran a card around the screen as suggested, got some visible dust, sand, debris, whatever from around screen and frame. Blew it out with compressed air and that appeared to work (previous post) for several days. Then it started acting up
again, as before.
As this is my back-up brain, I can't do with-out like this for too long, so I finally broke down and broke out the screw driver. I don't recommend this unless you have experience, but I found a small piece of a business card broken off in there.

I no longer keep cards in my leather case!
So keep up the great work that all you "Helpers" do. Us foolz need you.