[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 - Felix Fietkau (nbd)

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I don't think the eth0 issues are related at all, they should have a separate ticket. Please check if one exists already before you open up a new one. 
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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#comment1476