Shaking / Jittering reflections

Hello,

I have this test scene I made to try out high quality rendering with raytracing. I’m having the results I expect overall, but I’m getting very weird unstable reflections, that shake and jitter all over, as you can see in this export, notably on the “e” letter : UE_Test - YouTube

Do you know what could cause that ? I have no idea…
Please note that everything is raytrayced (AO, GI, Reflections, Translucency + Refraction. Exporting with Movie Render Queue I used Aliasing settings, bumping up Temporal Sample Count to 64 and checking “Override Anti Aliasing” as specified in documentation, might it matter.

Thank you in advance for your help.

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