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

[LEDE Bugs]

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FS#253 - Multicast over wireless ceases to work properly after a while on ath9k with many clients connected
User who did this: Mathias Kresin (mkresin)
Status: Unconfirmed -> Waiting on reporter

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=253