I have a floor with a reflection plane on it, first renders were perfectly fine but this is the second project I have this issue with: as the scene gets more complex, reflection planes begin misbehaving, here are two consecutive frames one with good reflections, the second all messed up, with a perfect mirror to show it’s not about roughness:
Good: https://i.stack.imgur.com/Zao9R.jpg
Bad: https://i.stack.imgur.com/Ql0jT.jpg
It only happens with reflection planes, not with SSR or cubemaps
What I have tried: All the SSR options, reflection plane settings, increasing samples, shadow size and soft shadow, changing the floor material, deactivating AO and bloom, deleting meshes.
The only thing that momentarily helps is restarting Blender, which works for about 10 frames and begins the cycle again.
If someone could give me any insight at all I would be grateful