Many don't receive a 2nd AOR. Relax! It's not a cause of concern. Yes, having asked for addnl docs is good - it shows that your b/ground check is On & your file is not gathering dust.
Qorax
Thanx QU, as you said it seems my b/ground check is on, already they asked me for addnl doc of my wife deg prove and already submieted to them, can they ask again additional documets? after submiting the doc there is chances of Medical Request?