Lighting Bug/Problem

Hello to everyone.

I started using Unity recently (2-3 months ago) and it was great up until now.. At first scene didn't have this error, but now I am having some lighting/lightmap problem. The problem that I have only appears after "Baking" the scene. I am using "Unity 5.5.1f1" (PC). In this scene I am using "Spot Lights", to be exact 35 "Spot Lights". Whole scene (every object in it) is set to "Static". Error that I am having appears on almost every surface in the scene, but at least for me it doesn't seem to be related to materials as it may appears completely random, some places it is on the whole material/object, other just fraction of material/object or none. My best guess is that there is something wrong with "Lightmaps", but I have no idea why they are the way they are or how to fix them. Only actual light objects cause this error "Emissive" materials work flawlessly.

This is how this error/bug looks. (this is supposed to be clean glass)

Things that I tried to do to fix it (nothing worked):

• Increasing "Lighting" parameters

• Decreasing "Lighting" parameters

• Editing "Hierarchy" from this to this

• Recreating whole scene from scratch

• Increasing "Shadow" distance

• Switching "Lighting" setting from "Baked" to "Realtime" and back.

• "Baking" this scene on different machine (PC)

• Saving the "game" as a standalone after and before "Baking" (error persists)

• Clearing "GI Cache" and "Baked data"

  Here is how the scene looks before "Baking