Reflection Probe Constant Following

I am creating my very first Game and the basic problem here is that I want my Metal Ball to be reflecting the Environment.

I have taken the Reflection Probe Cube and let it follow my Ball with a Script.
Now it's working, no problem there, but it seems like eveyrtime the Cube is touching another Mesh it just gets Darker.

I am using Realtime Rendering and not baking the Map, because my Ball isn't static.
You can see that clearer on the Pictures under this :


So right here you see my Reflection Probe, which in Playmode is moving etc.



Everytime the Reflection Probe Box is hitting another Mesh it gets Dark like this.


Just to show you how it looks like in Playmode


Any help is appreciated!

Best regards

 

Can you share your reflection probe settings?