I had thought I heard mentions of this before, if they are actually working on it who knows.

Personally, WTB account-wide ignores and increased ignore list.

There's a port you can block that stops your battletag connecting. I can't remember off the top of my head which port it is though.

Also, I constantly get this same error, despite having a battletag, but I don't have any OQ problems either. Weird.