There is an intermittent problem with internal DNS server ns-int-1 (137.82.1.2), so if anyone’s computers are hard-coded to point to that server without ns-int-2 (142.103.1.42) as a backup then some of their DNS queries may fail. For users with both servers configured the intermittent behavior may be less noticeable. We are working on resolving the issue with ns-int-1.