Next week will be quite a pack week for maintenances with Nintendo conducting various maintenances from Monday, 8 January 2018 to Wednesday, 10 January 2018.
If you play Animal Crossing: New Leaf or Pokemon (Ultra) Sun/Moon, do take note that service will be down on 8 January 2018, 17:00-19:00hrs PT (9 January 2018 10:00-12:00hrs JST)
If you are playing online games on the Nintendo Switch, do note that some online services may be down on 9 January 2018, 16:50-19:00hrs PT (10 January 2018 09:50-12:00hrs JST)
For those playing on Wii U and 3DS, expect intermittent service outage from 9 January 2018 to 10 January 2018, the timing can be seen below.
For more information, you can head to Nintendo’s network maintenance site here.