Sounds like a problem with your dns resolution, when it happens try doing ipconfig /flushdns (if you are running windows) and then try to reload.THis will flush your local cache, check your device and OS for specific instructions if it is not windows.
Also, you should go into your DNS settings and try using google's resolver or
quad9. Personally I use the latter.
This will bypass any stub resolvers you might have on your Wifi router and you can see where the problem is.