Sudden wireless loss - WRT1900ACS v2 (Shelby)

Guys,

This has happened several times already... everything works ok, until suddenly, with no apparent reason, all devices loss wifi connectivity to the router (haven't checked if cabled deviced lost it too, before you ask :)) .

After that, it is impossible to restablish wifi connectivity until I reboot the router.

The consistent message I see in the log when this happens is:

Sun Jun 25 19:07:55 2017 daemon.err hostapd: nl80211: EAPOL TX: No message of desired type
Sun Jun 25 19:07:55 2017 daemon.err hostapd: nl80211: EAPOL TX: No message of desired type

I'm running David's build Lede Reboot SNAPSHOT r4323-1898f73 / LuCI Master (git-17.152.82962-a9e8376) .

I'll appreciate any guidance on the matter...