I have the same problem. When searching for the router currently connected to, following message appear:
No ASUS router found. Please make sure your ASUS router is powered on.
Iphone 6 IOS 10.3.3
RT-AC5300 3.0.0.4.380_7743
ASUS Router app 1.0.0.0.61
I have changed the SSID name from the...