RT-AC68U problems with configuration

[hypedlt]

Well I'm out of ideas. It looks like it ought to be working.

What kind of internet connection do you have, cable, VDSL, etc? It's not a mobile (LTE) connection is it?

I have a fiber optic cable routed into my home with fiber to ethernet converter installed.

 

[hypedlt]

I have found a solution!
I've plugged in my old tp-link to see what diffrences are there between the WAN values and I've noticed that the MAC address used in WAN does not correspond the MAC on bottom sticker.
Copied the MAC into ASUS and it worked .. no more anomalies in my net.

Thanks for your inputs, case is closed.