let me tell you something, you have problem with your internet connection. when the internet speed is low, the OS freezes but not completely, I just let it be for 30 seconds and then the system keep running. If you are playing with spotpass or uses Miiverse heavily it will freeze your system for the same reasons, you can prove that easily. If the system make a heck of a noise, the hardware freezes, if not it is a connection issue. Sometimes is just because your speed connection is not stable. Try using it by turning off the internet connection.