1. Run Wireless Diagnostics Running Wireless diagnostics is a good place to start. You can do that with the native tool your macOS already have. Press Option and click the Wi-Fi icon in the top right corner. Click Open Wireless Diagnostics. 2. Reset Wi-Fi network settings
Be sure not to put the router on or near the large metal surfaces. For instance, if it's placed on a filing cabinet or near the radiator, it won't work properly. 1. Reboot your router. One of the first things you should try to resolve the Wi-Fi issues is to restart the router.
Look at the WiFi icon on your Mac's menu bar to check the status of your wireless connection. If the icon has a line across it, if its color is faded, or it's showing an exclamation mark — those are all indicators that WiFi is either off, not associated with a network, or there's no internet.
Update the Wi-Fi router. If you manage the network's Wi-Fi router, install the latest firmware updates for the router, as recommended by its manufacturer. It might also help to simply restart the router and use Apple's recommended settings for Wi-Fi routers and access points.
How to Diagnose Your Mac's Wi-Fi Problems; How to Fix Mac Wi-Fi Not Working After Sleep-Wake Cycle; Restart Your Mac; Disconnect Your USB and Wireless Signal Devices; Reset the NVRAM/PRAM and SMC; Reconfigure the DNS; Adjust Packet Size; Change Network Location and Renew DHCP Lease; Forget Your Wi-Fi Network; Check for System Software Updates
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