Latest about Wi Fi
Apple Addresses iPhone and iPod touch Wi-Fi and Bluetooth Problems - Reset, Redo, Restore, Repair
How to stop auto-joining a wifi network on Mac in High Sierra
You can stay signed in to a wifi network, but not automatically join it in High Sierra on Mac.
Why your iPhone and iPad don't fully disconnect from Wi-Fi and Bluetooth in iOS 11
Don't worry, nothing's wrong with your phone: everything is as Apple intended it.
