That’s exactly what I had first thought of as well. I’ve had this happen in other VFX tools. However, when I ticked the boxes in my various emitters to kill on complete, or set my durations low, it doesn’t seem to have an affect. It certainly “feels” like that’s the case, but I don’t know how to stop it or if I can. 
Also I’m more than happy to send you the asset file if you want to specifically see how I have it set up.