SOMEBODY (not me...) set the organizational settings to Try Beta Firmware to Yes, while I was out of pocket.
So the switch network upgraded itself to 12.9.
I had been holding on 10.45 due to issues experienced with 11.2x.
But I'm happy to report that 12.9 works fantastic for us, with none of the 11.2x issues that I experienced. Like Cisco IP phones going inexplicably offline repeatedly.
And it has some neat new features, like when you click on a client it will show you the entire network path from edge to core, for AP clients.
I turned the Try Beta Firmware back to No, but I'm not going to let it roll back. This firmware works good. No issues.