After replacing a Windows 2003 Standard server with a Windows 2016 Essentials server, I am getting no network errors from the server. However, it seems almost once an hour the workstations lose network connectivity. Checking their error logs the Dns server is timing out. Causing the network connections to drop for all sites momentarily. This is trouble some since they are trying to print large files off plotter printers, and it will cause those jobs to stop half way through. I have ran a dcdiag /test:dns and found that is pointing to the new dc. The tests are all successful I do not see any failed tests. The forwarders point to googles. No reverse lookup zone is present. The DHCP server is the fortigate and that is giving everyone the DNS server's IP and only that.