Shadow issue 4.12.5

Hello i created architectural exterior scene using 4.12.5 when camera is close to object static mesh shadow appears and it is fine but when camera goes back from object not close all shadows dissapear even on foliage ground.It is frustating i tried lod and changed lightmass settings but same.Could someone help me thank you very much

HI!

I think you need to configure the settings for the cascade shadow maps for directional lights.