Well, I have to say that after a bad start around 9pm gmt+1 (2 battles in 40 minutes) the joining system became more stable, without sending me back to port or other strange things. Just bad lag sometimes. Maybe there are problems during peak time.
Same problems here since yesterday afternoon, but tonight i found out a new one: once I have joined the battle i couldn't start the engine and open fire. Did they give any official answer?