Ellipsoid particle emmiter not colliding all the time

I'm using Ellipsoid particle emmiter to create object that will collide with a Cube. Function OnParticleCollision() is used to detect collision between particle and Cube. Everything is working fine, collision between these objects is detected, BUT not all the time. And I cannot figure out why is that happening. Here is the property for the Ellipsoid particle emiter, maybe that'll help


P.S. I saw that Ellipsoid particle emmiter is maybe out of date, but I've got project with that.