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For North American users of Nintendo Network, certain network services will be offline for online play, Super Mario Maker, Minecraft: Wii U Edition, starting this coming Sunday.
According to the Network Status page at Nintendo.com, the upcoming scheduled maintenance will start on Sunday, February 21 at 5PM to Monday, February 22 at 3AM Pacific time, with maintenance for online play, rankings and other network services not specified for users of Nintendo 3DS and Wii U.
Then, some unspecified network services will not be available but for just an hour on Monday, February 22 from 9PM to 10PM Pacific time for Super Mario Maker Bookmark.
The third scheduled maintenance this coming week will be on Thursday, February 25 from 4:50PM tp 6:30PM Pacific time for users of Minecraft: Wii U Edition. All network services will be affected during this time.
[Source]: Nintendo: Network Maintenance Information / Operational Status.