Since I am also still having problems here in Europe (Germany), I talked to the German iTunes Support today and they said, that the problems are caused by server problems on Apple's side. They are working on it and said they are awaiting a fix on sunday (20th june 2014). If it shouldn't work again by monday, I should call them again.
As a temporary workaround they proposed to sign off from iTunes and itunes Match. Restart the router (so the internet connection is reestablished) and then connect to itunes Match again.
Hope this helps you guys