Wifi gets stuck sometimes or works abnormally.
What to do: so if u want to reboot it without touching it then use its IP add which is normally 192.168.1.1 in web browser with( username : admin password :admin or check it from internet with its model ).After accessing web interface search reboot option under several tabs (usually in Mainteance or Sytem opions) and simply restart.
Conclusion: My WIFI router starts working after this mostly if not contact ISP.