Render error - flickering lights/shadows on particles

[tyFlow]

I can't see how this would be a tyFlow issue. Flickering is a common rendering problem and just putting a box in the same scene isn't going to be able to reproduce it. Your flickering surfaces are curved and moving and that can affect how glossy reflections, AI, etc are calculated.

You can bake your tyFlow geometry to objects using an Export Particles operator and then remove your tyFlow object to ensure tyFlow is not the cause.