Ap 1130 LWAP mode show only 802.11A

Hi, I have some AP 1130 who's had strange behavior. For sometimes now, some of these AP stop showing the 802.11b/g/n Radio interface. So I can't enable it anymore. I try to reset the AP to factory default, nothing change.
I had 2 controller WISM in my 6509E chassis
The boot version on the AP is 12.3.8
The software version is 7.0.0220.0
the ios version is 12.4(23c)JA3
Do you ever see these symptoms?
I didn't plug a console port directly on the AP because for now I didn't have a PC with a serial port, so I can't see if there any log in the AP.
Thanks for your help                  

Never mind. I upgraded one of the 6 to 12.3.JA2 and it now shows up as 802.11g. I guess this behaviour is a bug after all!!

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