Why are you at ISO3200 and f/32? I'd guess f/12-16 would work just as well, and you could easily go down to a lower ISO, and possibly faster shutter speed as well. *Note, I'm not a product photographer, so I don't know if that is normal
That being said...maybe a few specs of dust in the air that reflect the light just right onto a sensor that has it's ISO bumped up pretty far? Maybe some dust on or in the lens/sensor?