Can anyone explain this light/character rendering issue?

I need to figure out exactly where I am having issues with my light source. I have a spotlight in a part, following the camera. The problem is that the light doesn’t render in some situations. Manly location based I believe.
Spawning usually is dark. I have verified the light is in fact following the player, the light level of the source doesn’t seem to be an issue. I was very confused until I realized if my character moves to far from the original structure or above a specific height; it too fails to render. This leads me to believe it might be a memory problem. The game is generated at spawn and is roughly 40000 part instances.
Memory sits around 400. The problem exists in all studio tests and an active place.

Is this a common issue? Does anyone have a clue as to what I should look into?

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Example of the hard line of light rendering on wall*