Most common reason I've seen for crew induced go-around is:-
descent mis-managed
rushed approach, sometimes exacerbated by ATC
poor ATC vectoring
winds not as reported (usually in Spain!), ie. you get 15 knots + tailwind down the approach when you were expecting a head wind (we call it the "Spanish Calm" phenomenon - in Spain the wind always seems to be "calm" even when its 15 knots).
distraction by something else (traffic separation, technical, etc.)