Indeed, singpilot's post is spot on, but do not forget we do not know if any other 330s had the same series of 'failures' that night on that route, nor does the fact that 1 Qantas 330 suffered a serious pitch excursion while others flew happily along mean there is not an underlying technical issue. Unfortunately the chances of the CVR being of use are practically nil, so we have to go on what is 'known'. You cannot just fold your arms and say "crew issue, full stop"