I have a RouterBoard 433 with a 5GHz XR-5 radio card and a 2.4GHz XR-2 radio card, both running AP mode. I was running v4.17 but was having problems with clients staying associated to the 5GHz XR-5. The 2.4GHz XR-2 was working fine. I upgraded to v5.22 and my problem with clients staying associated to the XR-5 card seems to be better. Now I have no associations to my 2.4GHz XR-2 card. Any ideas why? All settings seem to be the same. I have upgraded the firmware. I have disabled then enabled the XR-2 card.

Thanks ... Jay

I haven't seen anything similar before, but I would suggest to turn it off, put the cards in different slots (2.4 in the one that was not in use, 5 in the previous 2.4 slot), turn it on, reset config, set up again.

jayk do they do something like connect/disconnect or they cant connect at all
if u use different brand for client CPE
MT v5.x in winbox on XR-2 see in wireless tab u can find option Wireless Protocol see if its set to unspecified or 802.11

RB493G upgrade from 5.10(5.11) to 5.22