Xfinity routers are one of the reliable router brand in the market. They provid ehigh speed internet connectivity but there are issues sometimes and you find Xfinity Wi-Fi not working. Here are some of the ways to fix the problem. Restart your modem through My Account online, go to the internet service tab, scroll down to devices and select restart modem. Start Troubleshooting which can take up to ten minutes. After restarting make sure your device is plugged in properly to a power source. Ensure your account updated. Try moving closer to the router for better connectivity.