There are 3 3DS units in my house. They average a Streetpass hit every 6 hours or so between them (each machine gets tagged by the other 2.) I've noticed that the tags stagger, sometimes by as much as an hour. Like this: Unit 1 tags Unit 2. Unit 2 Tags Unit 1 back. Hour goes by. Unit 3 tags Units 1 & 2. Both tag back. At home, this is odd but whatever. The strange part is if I take all 3 out with me. Unit 1 might get tagged. Unit 2 and 3 don't. Or it might be 2, and not 1 and 3. Sometimes 2 are tagged. I've never had all 3 tagged by the same passing Streetpass hit. I can guess they check in cycles, but having just 1 hit and not the others baffles me. Any ideas why this happens?