I see that unleashed firmware 18.104.22.168.233 has been released if you look on the master AP via the browser. I don't yet see it on the site hence there are no release notes available yet. I succesfully upgraded my 3 ap's (2 x R710 and 1 x R610) to unleashed 22.214.171.124.233 however 2 AP's (except the master) were having reboot loops. They come online and shortly after they were rebooting again. I flashed back to version 126.96.36.199.212. Was the release of 188.8.131.52.233 premature?
After investigating the reason that mobile App can't connect to my AP is due to some 3rd party DNS blacklist applying that block "commscope.pubnubapi.com", sorry my issue is not related to the latest Unleashed firmware.
P.S: I don't have "reboot" issue after applying 184.108.40.206.233 firmware almost 24 hours now.