I have a AI mesh network setup with GT-AX11000 at router and RP-AX56 setup as a repeater over Ethernet. AX mode is enabled on 2.4 and 5-1 networks, 5-2 is only enabled on the router (as the repeater does not support tri-band) and is AX only.
It worked fine until few days ago, when the repeater lost connection and I had to reset it.
Since reconnecting to the network I cannot get its 5 GHz band to work.
I see it enabled (mac address and everything) in the router admin page, but NetSpot and InSSIDer only see 2.4.*All devices connect only to 2.4.
I tried removing the node new reset and connecting again. At the time of connection the 5GHz node from the extender appeared in NetSpot, then once the Asus admin page confirmed the AI Mesh connection, disappeared again.
It also appears for a second if I change the settings of the wireless network (like wireless security from WPA3/2-Personal to WPA2-Personal, even on 5-2) then disappears again.
Therefore I don't believe it's a hardware issue with the repeater, something in the configurations disables the 5GHz band.