Reflection Flicker on Flat Metal Surfaces 3DS Max

[nickpazdan]

I'm at the end of my rope and nearly out of hair to pull out over this issue.

 

I'm trying to render out an animation for a client and I've followed Chaosgroup's suggestions for rendering scenes with moving objects and cached my Irradiance Map, I've found forum posts about using Brute Force instead and tried that, I've adjusted the subdivs of my reflection up and down and gone to Oz and back, but I'm still getting flickering in the reflections from frame to frame.

 

Does anyone know what causes this or if there's an easy fix? It's only happening in my specular and reflection channels, so I'm doubting it's a GI issue and more a material/VRay settings one, but I'm out of ideas.

 

Here's a link to a .gif I threw together where it's happening: http://imgur.com/a/l8fks