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Lighting Unloading?

After I build my lighting and launch my map, I am able to walk around for about a minute then I get a huge lag spike and the lighting completely unloads.
Any help would be appreciated.

-which engine version do you use?
-does this happen in every project?
-are your quality settings on “epic”
-do you play the map in the viewport or in standalone
-what exactly do you mean with unload? (could you post a video or a picture) :slight_smile: