This instability observed on out-of-the-box BBBW, possibly after a period 
of inactivity:

wl1271_sdio mmc2:0001:2: sdio write failed (-110)
wlcore: ERROR firmware boot failed despite 3 retries
wlan0: failed to remove key (0, ...) from hardware (-5)

which, of course, disables networking.

This error appears in several TI threads, but I didn't see any reports of 
fixes.  Also this: 
http://www.variscite.com/support-forum/viewtopic.php?t=292

Has anyone in userland dealt with this? Is it systemic or a hardware 
failure?

# uname -a
Linux beaglebone 4.4.30-ti-r64 #1 SMP Fri Nov 4 21:23:33 UTC 2016 armv7l 
GNU/Linux

There is more in the syslog, nearly 1000 lines during the minute wlan0 
comes down which I can post if anyone is interested.

Thanks for reading.

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