This is the problem,could you help me to resoved it?
1、Product & Software：
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:
The above operations have not helped, I wonder if the fault is a bug, or there are other related solutions.
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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Raise a TAC Case. This could be CSCus83638.
FYI: The controller is running en special engineering release firmware. Anything can happen.
Is the AP powered by POE or power injector ? Please share the screenshot of Wireless > Country from WLC GUI.