In my first animation http://vimeo.com/115258347 there are some 20 particle systems. Several of these stopped working at various unexpected times. Where they are supposed to spray particles towards a focal point and fall back under gravity, they would, at times stop for a rest half way through and then continue, or have a tantrum and throw all the particles in one big lump.
Going into Particle Systems Physics and switching from Newtownian to NONE and then back to Newtonian was affective.
Hi,
I think there have not been any replies to your post because it is impossible for someone to look at your animation and understand what you mean!
It is a very elaborate animation with many particle systems.
I think the best idea would be to try and isolate your problem by deleting all the particle systems you think are working until you separate the one that is not working.
I created a simple blend with 20 particle systems and there was no problem with the physics
Best of luck
Martin