Interface :wifi0
ARM History
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Time of Change Old Channel New Channel Old Power New Power Reason
-------------- ----------- ----------- --------- --------- ------
2014-10-09 13:48:39 100+ 52+ 24 24 R
When AP's use DFS channels, they are required to backoff when radar is detected. Looks like radar was detected in your case.
http://wifi-insider.com/wlan/dfs.htm
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