How to remove flashing from lights or models?

I have environments and some parts of them constatntly flash like rapid blinking lights.  Some textures on the ground also change lighting at times. like it'd be a bright day but when you get closer that part of the ground turns darker all of the sudden.

And this doesn't happen if i run the same game without VR in the regular monitor.
I'm using Oculus Rift CV1 and unity 5.4