AP1852I registered to WLC2504, unable to release 5G signal after using for a period of time！

[Rps-Cheers]

HI everyone，

This is the problem,could you help me to resoved it?

1、Product & Software：

WLC PID：AIR-CT2504-K9
AP PID：AIR-AP1852I-H-K9
software：8.2.121.5

2、Symptom：
The AP1852I can be registered to the WLC2504 normally and works normally. However, after a period of time (random time), the client cannot find the 5G signal (that is, only the 5G WLAN cannot be found), only 2.4G Can be found, so temporarily modify the 802.11a only WLAN Radio Policy to All, let the client use 2.4G wireless.

PS：The number of cases has occurred multiple times, and the fault phenomenon is consistent.

3、info on GUI:

4、Attempted method:

• Restart AP
• Restart WLC
• Close and re-enable 802.11a
• upgrade software to release 8.5

The above operations have not helped, I wonder if the fault is a bug, or there are other related solutions.

[Jurgens L]

On the WLC, check under Wireless ==> 802.11a/n/ac ==> DFS (802.11h)

Ensure Channel Announcement and Channel Quiet Mode is enabled.

Also, doublecheck your WLC logs for any RADAR events.

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[Rps-Cheers]

Thanks for your reply.
It is nothing helpful.

[Leo Laohoo]

Raise a TAC Case.  This could be CSCus83638. 

FYI:  The controller is running en special engineering release firmware.  Anything can happen.

[Rps-Cheers]

Hi Leo,
That's right,the controller is running a special engineering release firmware.
about bug CSCus83638,it tell us 5G cannot accept clients,but this is client cannot find 5G WIFI.

Thanks.

[patoberli]

Your AP is running on channel 149, is your client supporting this?
This channel is not supported by most European clients, for example, as it's from U-NII-3 Band.

[Rps-Cheers]

Sorry for late reply!
Yes,my devices support this channel.it's running normal before.
Thanks

[srkala]

Is the AP powered by POE or power injector ? Please share the screenshot of Wireless > Country from WLC GUI.

[Rps-Cheers]

Thank you for your help!

I have fixed this problem,i don't know the root reason,but it run well after i replace the old AP1852I.