Wifi just goes away!
iMac with 10.13.6, When I restart the system, wifi connects and works just fine. For awhile. But, how long is random, a day, a few days, a few hours, whatever. Then, it just drops. I have may other devices and my home wifi continues to work fine. I use the Google mesh, connected to Xfinity router.
When it hangs, if I try to connect to any other wifi, it hangs, like wifi is no longer operational. I tried stopping and restarting the wifi. No luck. So, I must reboot to regain a connection.
Does having two wifis in the house cause it to just drop all connections? My macbooks and ipads do not have this issue.
Even though your other devices work fine, it may still be worthwhile to restart the router and access points.
I agree with what others have said on this thread but also wanted to add that I would make sure that your Google mesh WiFi system is setup in bridge mode as you will only want one router on your network. Having two different WiFi's should not be causing this problem but it does add to the complexity as it is way to easy to have your devices connect to the wrong WiFi and then not have access to some or all of your other local devices.
Having said that, I am with @datafornothinandbitsforfree that I do think it is some 3rd party software that is causing the problem and I would also run though the troubleshooting steps that he has outlined above as well.