If web pages aren’t loading or streaming video keeps buffering, resetting your router and modem is one of the first things you should try, as it can fix a slew of Wi-Fi or Internet connection problems.
This works just like rebooting your Windows PC when you’re having issues. The software on your router and modem will shut down and restart in a fresh state. When you restart your modem, it will reconnect to your Internet service provider (ISP). Some routers—especially older ones—can slow down over time as they run. This is a software problem, and a quick restart can fix it.
Locate Your Router and Modem
Your wireless router likely has visible antennas. It’s the device that hosts your Wi-Fi network. Your router plugs into your modem, which is the device that communicates with your Internet service provider.
These might not be two separate devices. Some ISPs offer combined router and modem units, so you might only have one device to reboot.
If you’re in doubt, find your wireless router and see what it’s plugged into. If it’s plugged directly into an outlet, it’s likely a combined unit. If it’s plugged into another device, that then plugs into an outlet, you have two devices, and the other one is your modem.
Restart Your Router and Modem
This is a simple process, and you won’t be doing anything fancy. You’ll lose your Internet connection and Wi-Fi during the restart process, but everything will automatically reconnect in a few minutes.
First, unplug the power from both your router and modem (or just the one device, if it’s a combined unit). You should see a power connection on the back of each device.
We recommend waiting at least ten seconds before plugging them back in; wait for 30 if you want to be thorough.
Waiting ensures the capacitors in your router and modem completely discharge and forget any settings. It also ensures that the modem loses its connection with your ISP and will have to re-establish it. Waiting might not always be necessary, but it ensures that everything is fully shut down and ready to start fresh.
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Source : How to Reboot Your Router and Modem
