@Shaner41
I would advise using Parental controls rahter than actually using the featire to turn the WifI radios off. If your goal is to limit access to the internet, during bed time for example, devices assigned to the parental control profile for that would be blocked from the internet. This way devices that need connections to Wifi to communicate with other devices on your network or the internet would not be shut down (doorbell cameras, alarm systmes, etc...)
DNS settings have nothing to do with it but the router being able to keep accurate time. It may be turning the radios off at the wrong times. The only way your DNS settings might be causing a problem is if the servers you chose are not allowing the NTP server names to be resoled to proper IP addresses. This is highly unlikely. If you go to the command prompt and perfrom an nslookup with the name of the NTP server you are using, you should get some IPs back. For example:
nslookup us(dot)pool(dot)ntp(dot)org would return IPs associated with that time server. Replace the (dot) with . If the time looks good in the time settings area, this would not be the problem but thought I would explain DNS a little.