When all wireless LANS are defined on 1130AG and 1240AG access points converted to lightweight mode, and the radio environment is very busy, access point transmission attempts can be delayed. The 802.11g radios sometimes report this error:
%DOT11-2-RADIO_FAILED: Interface Dot11Radio0, failed - Radio command failed, cmd 121
(FF80,0,0) status 7F21 (5,0,0)
When the failure occurs, the radio restarts, all clients are disassociated, the failure is logged, and normal operation resumes.To resolve this issue Reduce the number of wireless LANs in use.