Do you have multiple computers or a laptop?

Then you probably have a router. Sometimes routers, just like computers, need to be restarted. KCTC commonly sells routers made by Netgear. These are small devices that will have the word NETGEAR printed across the front and top. Restart this device by unplugging it’s power adapter for a few seconds. After the power connector is reconnected it may take a minute to start up again. Now restart your computers.