kikolyI clearly said above that my Oneplus 5t connects to 5g when i turn off WiFi and turn it on again. Even redmi note 5 pro is connecting automatically. But in Rog 2, I have to manually go to WiFi settings and change it.
Android's logic is to find the next wifi signal connection when a wifi connection is broken. So when you connect to an AP, as long as the connection status is still there, regardless of the connection quality, the phone will still connect to that AP until the communication is disconnected.