You may have come across this report http://www.nzherald.co.nz/business/news/article.cfm?c_id=3&objectid=11860878 about problems with check-in processing at Auckland and Wellington “as a result of a global issue”.

This item from The Register https://www.theregister.co.uk/2017/05/22/sita_failure_australia/ gives a few more details, mentioning an international hookup called “SITA” which was hit by problems in the UK.