Windows 10 DNS server is slow

When I try to go to some web pages I get the following:

This site can’t be reached​

Check if there is a typo in (the URL I am trying for).
If spelling is correct, Link Removed.

There is no typo, and Windows Network Diagnostics says there is no problem. I can hit Reload and usually the site will emerge eventually. This only happens with some websites. I get a similar type of effect when trying to upload files to a server - cannot connect. But it eventually does. This is a relatively new problem for me. How to fix?

Thanks