I have an Archer AX90 Router and 2 x RE505X range extenders which for the past few weeks have been operating without issue in Onemesh mode (synced wifi name etc.).

Today, both RE505X units developed the same fault, the '2.4' LED turned off, indicating that they are only broadcasting on 5GHz, and this was confirmed by the disconnection of 2.4GHz devices attached to the repeater.

Despite rebooting the units, checking for firmware updates, and rebooting the router several times, the issue could not be resolved,

For now I have turned off one unit, the other I have been forced to put into standard wifi repeater mode with a different SSID for both wifi bands.

As both devices have this issue, has there been a firmware update to the router, or the RE505X that may be causing this?