[FS#253] Multicast over wireless ceases to work properly after a while on ath9k with many clients connected

[LEDE Bugs]

The following task has a new comment added:

FS#253 - Multicast over wireless ceases to work properly after a while on ath9k with many clients connected
User who did this - Michael Marley (mamarley)

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In fact, it seems to be worse now.  Multicast (and therefore IPv6) has stopped working within an hour of each time I reboot the WAP since I updated.  Previously (before the wireless-testing update) it would work for about a day or so before it stopped.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=253#comment781