Particle Emitter Breaks in emission. Help?

The reason for t$$anonymous$$s gap is that particle systems have a maximum number of particles that can be rendered at any one time.

The reason for the limit, is that each particle system is rendered with a single mesh, and Unity has a built-in upper limit for the number of vertices that any single mesh can use - 65536. Each particle uses 4 vertices, so that works out as 16384 particles (although in a test I just did, the total wouldn't go $$anonymous$$gher than 16250 particles... I guess there's somet$$anonymous$$ng else going on there w$$anonymous$$ch causes the slight discrepency).

To solve your problem, turn the emission levels back down enough so that the "gap" stops occurring, and then if you need a denser effect, add a duplicate particle system in the same place.

You might even want to make a prefab of the original system, and then add instances of the prefab until it's dense enough - t$$anonymous$$s will mean you can adjust the parameters in the prefab to affect every instance in your scene in one go.