Network settings won't save DNS servers This has to be simple: I can't save DNS servers in Network>(Location)>Advanced>DNS

I add the DNS servers


  1.1.1.1
  
  1.0.0.1
  
  2606:4700:4700::1111
  
  2606:4700:4700::1001


save, and then after a sleep, they revert back to what I assume are my ISPs DNS servers.

Any ideas? Is there a way to lock the panel settings?

Sierra Macbook Pro 1014
Turned out to be simple - my DSL router had DNS servers configured, and those were overriding the settings in the Network Control Panel due to DHCP being used. DHCP was grabbing the servers from the router and ISP.

So I changed DNS servers in the router, restarted the router and the Macbook, and then could see the 1.1.1.1 and 1.0.0.1 servers in the Advanced>TCP settings; they were grayed out since they were set in the router.