Shadow with hard edge

[Werbewelten]

Hello,
in my document there are several large circles with a shadow. Unfortunately all shadows have a hard edge.
They will also show up in my PDFs... See the screenshot. I tried everything but they are still there..

Is this a known problem? 

[Monika Gause]

It tends to pop up on the forums from time to time. How large are these bubbles?

What you could try:

Delete the shadow effect

Create a new fill for these objects in the appearance panel: black

Move fill below the white fill

Apply transform effect to move to bottom right

Apply Gaussian blur effect to smooth.

[Werbewelten]

Between 500 - 600mm. 

Okay i will try it, thank you. 

[Werbewelten]

I tried but the edges are at the exact same position.. 

[Monika Gause]

Does it get better in CPU preview?

How is Effects > Document raster effect settings set up?

[Werbewelten]

No changed nothing.
Document raster effect settings see screenshot