I have same issue with Wifi! It only connected once.. then when I tried the next day it does not connect no matter what I do, I tried turning it off and on and even rescan but the status and IP address is always not connected no matter what :( I am using 20200418 Pi 4 version.
EDIT: This is strange, I just left it at the NOT CONNECTED screen for sometime and it got connected after a while automatically! but WINSCP now gives me this error when I try to connect:
Still does not work! Abnormal slow behaviours... sometimes shows connected but not able to login... very slow response.. but it was working absolutely fine the last day! :( Dunno.. need to test further..