well, I had my nand get corrupted for no apparent reason. I was on sleep mode coming back to mega man legacy collection 1, then it said "a serious error has occurred, please restart the system." when I did that, it would no longer turn on. it was still under warranty, so I got a replacement. I'd suggest you do that if you're under warranty. I've had no problems with my refurbished system (yeah, they didn't repair the original, only told me what had happened. I lost all saves in the process, so I got nso immediately after getting the new system). my animal crossing switch has no issues either. I think what happened was the result of a faulty extension cable, because the system was using one, and when I removed the extension cable, all three prongs fell out. I'm using a direct connection now.