But you agree, probably not power failure walking up the computers? Probably some other hiccup?
On the contrary, minor power dropouts are my prime, in fact ONLY, suspect. A surge protector provides zero protection from momentary dropouts and they are far more common than most of us realize. The only protection from dropouts would be an
Uninterruptable Power Supply with its own battery.
Also, you don't have any idea on the shut down taking two rounds issue?
I have seen that behavior, but I never figured out what caused it. It invariably went away with a subsequent update to the OS.