[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 - IronicSven (IronicSven)

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Just tested r2942-27fbf54 on my TP-Link 1043nd v1. Wifi still disconnects and disappears.

Full log from wifi up to tx hung: http://pastebin.com/kYC9s9N3
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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#comment1241