Now here's the quote from the most helpful post I have found on the issue:
It seems that this is a problem specific to Singnet, so I encourage you all to contact them to see if you're able to provoke some changes on their end. Also, as a workaround, you can substitute the "www" in the URL where you encounter problems to "www2."
Gosh. If the problem is specific to Singnet, maybe it is high time to consider changing my internet service provider unless Singnet rectifies the issue?