In order to provide WiFi coverage for a small office area, a Cisco autonomous single-band 1041 (AIR-AP1041N-E-K9) is used, running software version 12.4.25d-JA1. The access point is having a basic configuration for a single SSID with WPA/TKIP + PSK.
Most of the wireless clients are laptops and smartphones. There is also a print server and a handheld computer. All of them can connect to the wireless network without issues and are getting proper service. However, every now and then all wireless clients get unreachable simultaneously for several minutes.
We have checked the RF environment and results were good:
- RSSI is greater than -60 dBm throughout the whole office area
- RSSI from surrounding wireless networks is at least 30 dB lower than RSSI from the office SSID
- Spectrum analysis confirms there are no interferences
We observed the following facts when the issue is happening:
- All WiFi clients lose connectivity at the same time, while wired devices have no issue
- The AP is reachable on its management IP address and reports the WiFi clients are still associated
- All wireless clients recover connectivity as soon as you connect a new client to the wireless network.
The radio interface is getting reset sometimes, but it does not happen when the issue is observed. Last time we found the issue we saw logs for the radio interface getting reset more than one hour ago before the issue.
I thought it could be a bug and have reviewed the list of bugs for this software version but couldn't find anything similar to this issue.
Did you ever face a similar problem? Could you find the root cause for it? What else could I check to narrow down the cause of the issue?