I'm not very tech-savvy. But this worked for me. I'm not sure what it does, so you may want to read more about it. My brother, who was having the same issue and who is pretty knowledgeable, said the fix was "safe."
In a nutshell, what you're doing is changing the address that your PS3 goes to whenever it asks "What is the IP address of this website?" Or, to put it in simpler terms - you just changed the card catalog you flip through whenever you're looking for a specific book in a library. Or you just changed the index in the back of an encyclopedia. It's taking you to the same website (or page number/location) in the end, but you're looking it up via a different method.