Flashing screen effect or lighting bug that only shows up in shipping build - Help

Hey all,

Been struggling to find the solution to this one. When I make a shipping build and play I get an odd flashing screen effect or light bleed or something. I does not show up in engine or in the development build.

Here is a video link

I have tried all sorts of stuff messing with my lighting, post processing so on but since it doesn’t happen anywhere but the shipping build i dont know how to debug it.

Thank you for any help!