[FS#558] 5GHz interface drops to channel 36 -- DFS?

[LEDE Bugs]

The following task has a new comment added:

FS#558 - 5GHz interface drops to channel 36 -- DFS?
User who did this - Juliusz Chroboczek (jch)

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No, this is not a duplicate.  FS#506 is about DFS being disabled on the reporter's hardware.  On my hardware, the DFS working fine, but it's never switching back to the original channel after seeing (what it interprets as) a radar pulse.

  DFS support for macVersion = 0x80, macRev = 0x2: enabled
  Pulse detector statistics:
      pulse events reported    :      24919
      invalid pulse events     :          0
      DFS pulses detected      :      22071
      Datalen discards         :          0
      RSSI discards            :       2686
      BW info discards         :        162
      Primary channel pulses   :      23368
      Secondary channel pulses :        705
      Dual channel pulses      :        684
  Radar detector statistics (current DFS region: 2)
      Pulse events processed   :      22658
      Radars detected          :          1
  Global Pool statistics:
      Pool references          :         14
      Pulses allocated         :        238
      Pulses alloc error       :          0
      Pulses in use            :          9
      Seqs. allocated          :        330
      Seqs. alloc error        :          0
      Seqs. in use             :          0

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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=558#comment1994