There were some huge transfers that were made prior to their unscheduled announcement of maintenance. Over $3 million transfered. They wrote on their Twitter about it and they said they incurred "significant losses".

https://twitter.com/Cryptopia_NZ/status/1085084168852291586?s=19

Lots of people claim it's an Exit Scam but locals in New Zealand suggest otherwise. Could be a scam, could be a real hack, all I know is that if they come back, I'm going to be more cautious with them.