I have 4x AP-541N clustered on my network, connected via Ethernet to a network switch. I think I have experienced most of the problems previous posters have mentioned. Can a member of Cisco support provide an update regarding degradation of service? At any given time, it would appear that 1 of my 4 AP's is suffering from poor signal strength, the AP is always different. The symptoms can last between 1-5 hours, the event log does not indicate that there is a problem. The user experiance's an average data transfer rate of between 1-5 Mbps or alternatively, the network appears unavailable.
Is the advise below the only suggested fix;
Try to just disable 'Key Refresh' in each VAP. Set the Broadcast Key Refresh Rate to 0 for each vap that does WPA(personal or enterprise).
I look forward to receiving a reply.