Guys , I have the a problem on the good .427 firmware as well where the webpages in chrome on my Android mobile phone will show a can't be reached page , the subsequently reloads and gets loaded. Not sure if this problem is related to that people are discussing in this topic. But I recalled...
I am not sure which setting works. But doing the steps above seem to make my WiFi AC devices connect to 5ghz more. Especially my redmi smartphone which always connects at 2.4ghz previously now connects to the 5ghz more.
I kept the WiFi agile option on
This is because the 2.4ghz radio starts first or something after applying changes . The 5ghz takes a while to show up. The client connects to the first available band
My take is that the smartconnect which is. Asus feature and WiFi agile multi and may be conflicting with each other. So disable smart connect and separating the ssids works better
Disable roaming assistant for 2.4 GHz
-90 for roaming assistant under 5ghz
Try these values. If they are not satisfactory, disable smart connect and use 2 separate ssids.