Got an early Christmas pressent in my 3DS XL last night. I charged it up, set it up, and began messing around with things. I hadn't put in a game or anything and noticed I kept getting this error randomly. I actually got it when I tried to acces the Nintendo Network ID Settings as well. -_-
And when I began playing Super Mario 3D Land and got to W2, I got that message. I still haven't been able to access W2.
The only things I've read about this say that I need to get it repaired but those were for 1-3 year old devices. I've had mine in hand for less than 12 hours, I haven't dropped it, but I just realized the box has a small crumple in it where it looks like it might have been dropped before I received it...