4118 for both. I was surprised because that version wasn't listed on the update page (
http://www.asus.com/US/Networking/RTAC68U/HelpDesk_Download/). The latest offered there is 3831 dated 9/8/16.
This morning I did a factory reset - after I entered all my stuff again (I did back up the configuration, but decided to enter everything manually instead of relying on a possibly corrupt backup) I had the same thing - it's retrying to pool.ntp.org every two minutes, and never getting the right time.
The other curious thing is that since the upgrade dual-WAN doesn't seem to work. I have a backup cell connection through an old Cradlepoint router, and that worked fine as a failover backup - now, no joy.