I'm having an issue with some 3 access points out of 7 in a customer's site, indeed they aren't spreading SSIDs on 2.4GHz even if the WLC configuration is well done and it's similar to the other access points on site that are well functioning under both frequencies "2.4 & 5". Both radio interfaces are UP "Radio0 & Radio1", also i'm seeing some packets rates on the interface Radio0, so i'm here willing to have your feedback regarding this case; If anyone of you have encountered the same issue and can help about this matter.
Could it be due to an interference issue?
NB: This issue was reported by the customer of site, after he performed a coverage test he noticed this issue.
I think I have read something about a bug like this in a fairly old release, but I'm not sure if it was only the 802.11ac Wave2 models or even the older ones. Does an affected AP start to work again after a power cycle?