Well, pulling the memory card and pushing it back in seems to have completely solved the intermittent blank shot problem. Either foreign material or some kind of film on the contacts was (hopefully) the problem. Don’t know how much forward voltage there is on those data contacts but it can’t be much.
This is my third digital camera, not counting my iPhone, and the first one that I might actually tolerate. So far I find that I can hit correct focus perhaps 6 or 7 times out of 10 tries and it seems to be getting better.
I like the small size, and that, like most mirrorless you can fit a huge number of legacy lenses. I’ll deal with the question of whether anyone should fit old manual focus lenses to the camera .......later.