dns resolution only works with external dns fails if uses server2012r2 as dns

server 2012r2 is the only domain controller, teamed NICs, been operating fine for 2 years,  2 days ago nslookup 8.8.8.8 fails with cannot resolve host.  I can successfully ping 8.8.8.8, or anything else.  google.com webpage will load, duckduckgo.com webpage will load, but any other website fails with server not found.  The day this started, some phones were replaced, and 2 data drops were repaired.  Phone service is provided by Centurylink and internet provided by satellite (wildblue).
When I arrived onsite I noticed the server network profile was private not domain, I rebooted and came back as domain profile.   Firewall for domain is off.  
At a workstation if hard code dns to 8.8.8.8 any website will load.
Swapped out fortigate router  (60d) with a linksys e1000 same issue.
Temporarily disabled antivirus, still have issue
On server dcdiag /test:dns fails on 1 root hints server; all other test pass; can't add forwarder 8.8.8.8 because it can't resolve
Carbonite works and backs up, remote access works, update for antivirus fails
fortigate- installed latest firmware, will return and install tomorrow.  If still have issue, any suggestion on what to try next?