Blender/Mobile shadow issues

Hi,

I have recently followed the Unreal Engine tutorial on YouTube “Endless Runner w/ Blueprints” to make a random 3D side scroller. The tutorial was great and fantastic to follow. However my player is running through a city. When I went to create different “tiles” in Blender I got horrible shading issues in the corner (like the screenshot below). I have tried to follow every tutorial to eliminate this but it is not working. As the tiles spawn randomly I cannot bake the lightmaps but luckily at this stage performance doesn’t suffer when deployed on a Samsung galaxy 5. I love using UE4 but am getting really frustrated. Is this a simple fix or is there a better way I should be designing my side scroller.

Thank you

Just a guess, but my bet is that your normals are all soft, and as such you are getting an artifact. If thats not the case, my second guess would be a material issue. Hard to say without seeing more content. Best of luck.