[FS#583] ieee80211 phy0: rt2x00queue_write_tx_frame: Error - Arrived at non-free entry in the non-full queue

[LEDE Bugs]

The following task has a new comment added:

FS#583 - ieee80211 phy0: rt2x00queue_write_tx_frame: Error - Arrived at non-free entry in the non-full queue 
User who did this - John G (breezer)

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I also see this exact same problem on my Fonera 2.0n (2300), with openwrt 15.5, 15.5.1, and Lede latest release (17.01.0 r3205). That is an 8Mb/64Mb RT305x device with 1 USB2.0 port, 4-port switch plus an uplink.
It works fine on the latest developers 2.3.8.0-beta1 image, wifi is stable and long lasting but they do have their own version of everything - I suspect it might be quite an old kernel.

Issues that may be similar/same for exploration, on OpenWRT mostly (so external links from here, added to this comment) - quote from it may be useful/not, I've not yet found a fix without rebooting but trying a few based on people's comments on other bugtracker issues over time:

(from anonymous):I discovered that the problem occurs with kernel 3.14 and newer. With 3.10 wifi is working as expected
(reply to above):With kernel 3.10.49 wifi has this problem too.

(from anonymous):Choas Calmer rev 42618 is the first with kernel 3.14.18 for lantiq.
On my ARV752DPW iw dev wlan0 scan shows nothing. After that I patched the sources to use the old kernel 3.10.49. With that kernel iw scan is working as expected.

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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=583#comment2330