@UKJim Hmmm. That does sound like a bug! If not a bug, then possibly something you won't be able to work around in the remaining time unless @Hank21 can get you a quick beta load built that prevents...

@jedigrover Disabling mesh will likely have resolved the issue. You were probably creating loops which result in the port getting shutdown. However, this probably means there is a bug in the AP...

@UKJim If the 215RX bridge is anything like the TPlink wall APs which also have 3 LAN ports, one with POE, then they should just work as if they were ports of the same switch the 215TX is plugged...

@UnDiUdin IF you have a backup of the old controller AND IF you restore that backup to a new controller of the same or newer vintage (use the same just in case...you can download older controller...

@TalkiToaster Just so we can follow along better, can you repost the Topograhy image but with the "Labels" enabled? It will then show ports and wifi strength.

@JavierHernandez As Hank said, don't tick any of those boxes unless you actually want tagging to occur. Otherwise, they all simply act as a L2 switch attached to the uplink port of the AP.