tiny, hello. I got it when update to 1.9.6 but found a solution for myself. I don't really thought that it was oQ, btw.
Its appear in 'peaks' time and if you I have a lot (~15+) b.net friends by pressing find mesh. Client complete frozen when log in char and recieved 1st b.net messages w/ premade, for any characters at any realm.
My PC is 7 year old (yes, it is and I still can play on it ;) ). What do I do to fix - I clear b.net friends list by myself a-a-a-and that it. I has no freeze for now.
So I believe b.net system start be complete retarded to players. Why? I see perfomance drop when got a lot b.net friends, even if oQ turn off (not loaded).