Ah, well I am happy that I am not the only one to complain on the new MBA 5GHz connection issues ;/ I disabled the Apple Watch login function but it seems that still the issue occurs - not so often as earlier but still, it's kinda frustrating that all other devices are working correctly with the router (including 2017 ipad, iphones, lenovo thinkpad) and only the new macbook has issues ;/
I saw that people are trying macOS 11.2 beta - are you folks seeing network issues with updated os? I really hope this is an software issue and can be solved...