How to fix Mac disconnecting from wi-Fi after Sleep-Wake

Step #1. Open the Apple menu and then click on System Preferences.

Step #2. Click on Network.

Step #3. Now, click on the Wi-Fi option on the left → Next up, click the Advanced button.

Step #4. Click on anything inside the Preferred Networks panel. Then, press Command+A to select all and then hit the minus [-] option beneath the panel to remove all Wi-Fi Networks → Press Okay

You will return to the Network Panel. Now, let’s add your Wi-fi network back.

Step #5. Click on the Locations pull-down menu and then click on Edit Locations.

Step #6. Hit [+] plus sign to add network location and type in any name → Click on Done.

Step #7. Press “Apply” and log out of System preferences.

You will be asked to enter the Wi-Fi password once Mac identifies and connects to the WiFi network. That should be it.