There is no danger or serious safety issues:
http://mobile.nzherald.co.nz/nz/news/article.php?c_id=1&objectid=11469866
"advised by the Civil Aviation Authority and Airways NZ that there has been an outage to the nationwide air radar network, the cause of which is not yet known. All departures have been suspended and the landing of any incoming aircraft is being staggered ."