I discovered what was causing my Mac Studio to re-start itself after shut has been completed. I have 4 external Seagate storage drives connected. If I take any of these offline (storage drives donʻt need to be spinning all day when they arenʻt being accessed) and shut down, the Mac Studio will reboot itself and give me a notice about a shut down issue. If I leave them running, no problem. The Mac will shut down.
So, is there a way to tell Mac if I take any external drive offline to shut down when I ask it to?