cleaning up volume grid artifacts?

[squintnic]

hi im having a problem with spotty volume grid smoke (they are simmed in phoenix and loaded in volumegrid)
what parameter do I adjust to get rid of the spotty artifacts in the smoke? is it the volume grid settings somewhere?

the sampling is at 1/32 and 0.03

this is a section showing the Atmosphere pass
cheers

[kagemaru]

Try disabling the light cache speedup.
You'll get much slower renders but those artifacts should go away.