Holy.... both beta were too smooth with me, no issues what so ever, once I bought the game, I got into multiple issues, fixed all of them except for this one, this error doesn't even let me finish off 1 game!!! I've been playing for 3 hours and yet I'm still level 1 because this error kicks me mid-game!!!!! I'm so frustriated....... please I want a fix for this, at least an explaination to this issue!!!!
I've recognized that everytime I had this error I also had a timeout in Battlenet. So I decided to follow the steps Battlenet suggested to fix my connection issues. After restarting my router, resetting my dns cache (open cmd as admin -> type ipconfig/flushdns) and restarting the Battlenet app it worked perfectly fine. 6 hours of gaming whithout this stupid error up till now.
Hope this works for you as well