no idea what the recommended way is.
I usualy just pull the plug since there is no power-button on my device.
The reboot-option can be tried, even it didn't help solve connection problems I have had in the past.
When I shut down/restart my Network, I usualy turn off all devices and then start up the devices one by one with some waiting time in between. (Modem -> Router -> Switches -> Access-Points -> NAS -> Printer -> PC)