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Irradiance map issues

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I am experimenting with irradiance maps for use in ambient diffuse lighting. I've encountered an issue where when I sample the cube map I get weird banding and harsh falloffs. When I move an object around that is using an irradiance map its extremely noticeable. Anyone have any ideas as to what the issue could be? My shader is very simple:

float4 ambientDiffuse = texCUBE(irradianceCubeMap, worldSpaceNormal) * DiffuseTexture;
return ambientDiffuse;


This is what I see as a result

wqvrdl.png

You'll notice it moves from dark to light very abruptly and it looks terrible when in motion. I've tested with multiple cube maps but I always see the same thing.

Thanks for any help

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