Investigate router or broadband modem issues If you're connected to a hotspot or domain network, contact the network administrator. ...

Investigate router or broadband modem issues
If you're connected to a hotspot or domain network, contact the network administrator. Otherwise:
    1.  Unplug or turn off the device.
    2.  After all the lights on the device are off, wait at least 10 seconds.
    3.  Turn the device on or plug it back into the power outlet.
To restart a router or modem that has a built-in battery, press and quickly release the Reset button.