[FS#1450] ath9k Wifi hangup on Channel 11 at low load

[LEDE Bugs]

The following task has a new comment added:

FS#1450 - ath9k Wifi hangup on Channel 11 at low load
User who did this - 4034 (4034)

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I'm seeing something similar on a BT Home Hub 5A.  In my case I was getting a tiny amount of throughput, ~0.02Mb/s router->client but the other direction was pretty much OK.  After switching to channel 6, everything is still working normally after 24 hours.

I think this is a regression from 17.01.4 as a) I used that for a few days without issue and b) this is quite a popular device in the UK so we'd be seeing more reports.
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=1450#comment4518