WiFi and Bluetooth connections might interfere with each other. If you’re not much of a Bluetooth user, disabling it can help. In the Apple Menu, go to System Preferences –> Bluetooth –> Disable Bluetooth. In most cases, switching the Bluetooth connection off will be the end of WiFi issues.

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How To Fix Mac Won't Connect To WiFi | Technobezz Jan 20, 2020 How to troubleshoot Mac Wi-Fi problems | Macworld Your Mac’s ability to maintain a good Wi-Fi connection is a function of both of these signal types: If the signal from your router to your computer is too weak or if there’s too much noise Wi-Fi won’t turn on on Mac | Read how to fix it Sep 22, 2017