Wifi adapter stopped working in this build. Uninstalled and it wouldn't reinstall. Couldn't even detect the wifi adapter. Could not get it working again after multiple shutdowns and power on.
EDIT: Rolled back to previous build. Works like a champ. Gonna perform another update to build 16215 again and see if issue resolves or persists again. Happened after ~24hours. Will post back with what I find.
EDIT2: Reinstalled the build again. Same exact issue. After build is installed, lost all network connectivities, both wired and wireless. Reinstalling network adapters did not resolve the issue. Rebooted and shutdown many times with no luck. Rolled back to previous build again. Then things got crazy. Unit will not load Windows, kept boot looping, then gave option to do advance repairs on several occasions. Powered off unit and waited. Powered it on again fine. Wired network does not work, but wireless does work. Leaving it as is for now. Went back to SLOW ring to avoid this build.