Check out Apple Support to see how to start your Mac in safe mode. If your Mac restarts or shuts down when you start up in safe mode, it usually means that OSX is trying to fix a problem it has encountered. Contact Apple Support if this keeps happening. Opening ports can help direct the flow of internet traffic so you can connect easier.

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Mac keeps losing internet connection - Re… - Apple Community Jun 27, 2015 Troubleshooting & repair support for Internet customers Get help troubleshooting your Wi-Fi gateway and internet service. AT&T has you covered with Troubleshooting & repair support, troubleshooting, how-to articles, & videos.

Help a Fellow Mac User With Remote Tech Support - The New

How to Fix a Mac with WiFi Problems and Dropping Related: How to Connect Your iDevice to Your Mac’s Internet Connection Without a Wifi Router. Reset the NVRAM/PRAM and SMC. I first started having connection issues while running macOS Sierra’s public beta. Of course, start by restarting your Mac to see if this resolves the issues. Otherwise, try to reset the PRAM (Parameter Random-Access