I use 2 AR150 with success and happyness (one in backup and one main).
I use them with mwan3 and several internet connections to avoid connection problems on the 2 internet links, one by wire and one by air, wire link to wan port and the air one by wifi bridge.
But when one is unavailable, if I turn off the air one for example, my main wifi network SSID AR150 disappear. It seems it is due to wifi interface reconfiguration, and come back either because I bring air to life, or if I change config in interfaces.
Can I have my main wifi network always on even if changes are done on wan sides without modifying config each time?
Actually I think we fixed this by repeater manager. If main ssid is off then your repeater will be disabled. This needs 10 to 20 seconds so it doesn’t happen immediately.