I just got my 2018 MacBook Air a few days ago and with this machine I experience a lot of WiFi issues. Even after installing 10.14.5 the WiFi connection drops after 15-20 minutes. I can only disable and re-enable WiFi to get a new connection. I did not a restore from previous backup, instead I used to setup a new fresh out-of-the-box setup. So in general the same issues like addressed here: https://discussions.apple.com/thread/8657344 Before I never ever had such strange issues e.g. my 2016 MacBook Pro or my iPhone X or 2018 iPad Pro or even my iMac run perfectly fine and stable via WiFi. All other devices at home are running fine. Anyone out there with the same issue? How did you solve it? Got a replacement MacBook Air, or what?