I have this issue and most of my friends too. My internet conection is fine for all games that i play, except Diablo 3. My computer has no problem with no othergame that i play, except Diablo 3. i believe that this issue didnt go away like you believe. Blizzard cant fix this and just has nothing to say about it.
For those doesn’t know which issue i’m talking about, click in the link. If you observe the date of the topic is June/20.