As Anton said you remove the voltage with ...inlinpower.
But set port disable is also an Option to disable the network traffic.
Therefore: set port disable ge.x.y
set port inlinpower ge.x.y admin off
I prefer to wait at least one Minute and then restart the power and traffic:
set port inlinpower ge.x.y admin auto
set port enable ge.x.y
i had an issue with a Controller. I tried several things. Then forgot to enable the port because of interruption. Then if i concentrated on the issue again, enabling the port, the Controller woke up.
May be you have a similar Situation.
If the clock has a static IP, the unstable state may have returned the device to factory default or is in a dead state. IF IP is dynamic, please verify DHCP server sees request and has an entry in its database.