[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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Thank you for investigating the issue.

The network has one router (an x86_64 box running pfSense 2.3.2) with the WAP (a Ubiquiti UAP-LR) directly connected to one of its Ethernet ports.  The Ethernet connection does use multiple VLANs, if that matters, one for management and three others that become three SSIDs on the WAP.

When the multicast issues start, it seems that all multicast packets fail to be transmitted to all clients permanently with the only fix being to reboot the WAP (or do "/etc/init.d/network restart").  Occasionally one will make it through to a single client, but there is no pattern to this behavior.
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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#comment1521