Grey/Dark line between two cubes

I’m currently developing a mobile game and have encountered the following issue:
I have multiple cubes aligned side by side programmatically.
In Editor everything looks fine (see Screen 1):
123046-correct.png
But on mobile (Android & iOS) it draws those grey/black lines between some of these cubes (see Screen 2):
123047-wrong-mobile.png
This only occurs if the camera is a bit away.
If I zoom in they disappear on Android but remain on iOS.

I’m not using any texture like an image.
Just a simple shader from the Assetstore:
“Minimalist Free”

Hope someone can help me with this problem

Sorry I don’t personally know, but I had the same issue. It’s weird and it could just be a problem within Unity.

Check all your editor and project settings to see if there is anything wrong.