As other people have reported earlier, there is a problem with error 318, getting booted from the server for spamming.
I get this since update 39, never had that before. I followed the link in the other post, my internet connection is ok, i am not spamming anything and i disabled all addons. I still get booted. This only happens when i tab out of the game to look something up on the internet. When i tab back into the game i get error 318.