At the beginning of the month, I bought my 2 daughters a 3DS XL each (I already had mine). We've been StreetPassing 2-3 times per day and the girls have been trying to collect all my puzzle pieces, working together to make sure they don't take the same piece from me so they can collect them faster. Since yesterday, their 3DS consoles stopped communicating with each other. They both communicate with mine fine, and they're able to local play wireless games together, it's just StreetPass that isn't working (not even for games). Today, I checked them both and one of the Miis is missing from the other 3DS's plaza. I asked my little girl if she'd erased it and she said no, but she probably did it without realising. Does anyone how I can fix it so they start communicating properly again? I've looked all over the Nintendo website with no luck, and I've tried changing the Mii characters used for StreetPass. It's like one 3DS has blacklisted the other or something.