I set up my wifi extender in order to plug in a tv in a room away from the router, but the wifi extender won't work unless I reboot the router, only then it will connect to the wifi and give the tv wifi signal, it randomly appears and dissappears from the tether app, right now it says I have no devices found and it asks me to set up a device like I have done before, the extender wifi signals are already set up and you can't connect to them because it says  couldn't get IP address, my tv is connected to the extended wifi but it says that there's no signal from it (no wifi signal), only after rebooting the modem, the wifi extender shows up and works again, I would like a fix to this, because I can't be rebooting my modem everytime the extender goes missing from the app or when I turn my tv on