You didn't say which IP address pool you gave to the DHCP server.
Therein lies your answer.
It stops it working though, which is almost the same thing.yes, it is. the shutdown command on RouterBOARD devices doesn't turn off the device.
No, it should not.Automatic upgrade should be the default
Only if you're using the Micro$oft definition of 'best', which really means worst.and is quickly becoming best practice.