I think the RX10 III is done.
The last picture I took with it that I really had control of the functions was on the evening of my last day of vacation, 8/20/22.
It had an episode of freezing some time ago, but after removing the battery for a while it seemed to come back,
and I took many, many more pictures with it following that time.
A day or so before it froze completely it froze temporarily, and removing the battery/
changing the SD card seemed to work and I was able to get a few last pictures of the sunset.
Ironically, I suppose.
It took five more pictures after this the next morning.
I'm going to keep investigating a fix, but I'm not sure it's coming back.
I think there's a factory reset function, but believe it's located in the menu - which I'm locked out of.
I certainly can't rely on it anymore.