I downloaded and installed a fresh install of OS Mojave, but ever since then I am getting wifi issues which I can't seem to resolve. I could be using the machine fine, as now, wifi is connected but then decides to loose the connection without disconnecting. I have tried to remove (forget) the network and reinstall, that didn't work, reset the PRAM and NVRAM that didn't work. Changed channel on the router and separated out 2.4 from 5ghz that didn't work. None of the other machines that have not been upgraded have been affected, the iPhone works fine too, just this one I have upgraded so far. What else can I do?