I have 6 users on a small WLAN. The AP is an 1100 Series, and I currently have no WEP encryption enabled (nor WPA) for testing purposes. The network has worked fine for a few months without any disruption, however I now have (2) of the (6) wireless clients disconnecting intermittently. The error states: Packet to client <client MAC address> reached max retries, removing the client. It just started happening yesterday & reoccured today. One thing that is very strange is that it doesn't occur until the afternoon hours and only happens maybe once every hour or greater.
I performed a site survey using the ACU, and have "Excellent" reception from both locations. I also fired up NetStumbler to see if there are any more AP operating on that channel (9). The IOS is configured to find the least congested channel (1-11 enabled) and for "best range". I also looked at the SNR using NetStumbler, which averages -65. Upon performing a "carrier busy test" all frequencies are below 30%. I cannot figure out what is causing this. The clients experiencing this problem have a 350 and the other has a CB21ABG card.
What's really strange is one of the users has another user sitting right next to her (within 5 feet) and doesn't experience any problems at all.
I know the error points to congestion of interference, but the site survey doesn't show any other AP operating on that frequency.
What other things can I look at to find the cause? Thanks in advance.