Community cases jumped to 20 yesterday, but only one of those is unlinked.
The Ministry of Health says fluctuations at this stage of the outbreak are perfectly normal.
Tomorrow Cabinet will decide if Auckland will shift to level 3.
One of the concerns if Auckland remains in level 4 is lockdown fatigue: the mental health and economic impacts as well as the likelihood that people will no longer follow the level 4 rules.
Epidemiologist Michael Baker says lockdown fatigue is something Cabinet should consider when looking at whether they extend the lockdown.