Maybe you bought SimCity today.
BZZZZZZZZZZZZZZZZ. This is horrible. Kotaku reader vipeness sent in this video, which shows his Wii U hard-locking and crashing during a game of Nintendo Land.
The Nintendo support forums and our tips email alike are packed with reports that Wii system update 4.2 is doing horrible things to Wii consoles, and not just the modded ones.