Flashing Particles

Hi,

I have a particle system that has been randomly flashing. Almost as if the whole system is shaking uncontrollably.

You can find demo video and screenshots of the settings here. In the demo video, I'm referring to the softer dust, not the chunks of wall. The wall chunks are a separate FBX. There's no animated texture involved...I thought it might be a rendering speed issue but it happens even at very low particle counts.

I don't think it is something to do with my settings directly because earlier I saved and restarted and the issue went away. The particles all flowed smoothly along their paths as expected. Then, without touching the particle system since fixing them, the issue returned and now persists when closing and opening the project.

Please help <3

~Naomi