[FS#13] Ath9k AP stays up for connected clients but doesn't show in scan on new ones

[LEDE Bugs]

The following task has a new comment added:

FS#13 - Ath9k AP stays up for connected clients but doesn't show in scan on new ones
User who did this - Mark Williamson (mjw99)

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Just a "Me too". I am seeing this with a NETGEAR WNR2000v1 on r2449-7c47f43; it takes around a day for it to manifest.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=13#comment1148