Game disconnected: Client closed down connection make sure...port 3659 is open.

Same problem here since the latest patch. I've tried numerous fixes including the port forwarding and nothing seems to work.

Sometimes the game will lock up for about 10 seconds and then it'll resume and I can continue but 9/10 times it locks up completely and sends me back to battle log with the 3659 error. 

Really really frustrating as i've just started getting back into BF4 after a bit of a break and I had no problems up to this point.