Something is up with the Miiverse that is causing the system to lockup during certain games, such as Nintendo Land. The only option (for me at least) that temporarily fixes this is deleting all your wi-fi profiles so that you are not connected to the internet. Until we get a system update that fixes this, I suggest you all to do what I did to prevent your system from a possible bricking event. Keep check the internet on your computer for any news on a new update. It seriously sounds like an overused vibrator when it locks up.