Out in town yesterday. Usually I max out no problem. Today though I only hit one relay. This is either less relays than before or interval between streetpass mode and Internet mode as modified such that it is much harder to hit.
My route was noting special but going through town the first time I got no hits. The return trip is what got me one relay hit. A disappointing one at that as most the games didn't get anything.
@Robin64. My futile tests (to try and get the Pokemon demo via these) yesterday noticed I think it was NintendoSpotPass3 (and maybe 4) does not act as a Nintendo Zone. 1&2 still did. 5 wouldn't connect to the Internet at all (but did blink). Finding out out what SSIDs they use might be helpful to work out which are dead. Assuming the SSID are broadcast that it.
What i have noticed is if you empty the queue on the mii plaza then you'll keep getting hits but if you leave it full, it seems that you'll hardly get any hits because it ignores the mii plaza hits because the gate is full it's then only looking for hits to the games you own & have streetpass data activated for but that's just the luck of somone having the same games as you.
From what I understand it requires anyone but yourself (I assume relays don't let you pass yourself these days) to have passed that relay with the game. As in it won't erase game specific ones if someone doesn't have them.
For homepass I remember there was an initiative to have some MAC addresses game specific so that people with less popular games could at least get one hit but I imagine for unpopular games it did not't help a lot.