Well. Whenever i play fortnite, my pc wont load anything correctly and everything looks like a piece of art. Certain parts of the map will look like all round and i wont be able to enter any buildings. when i go onto certain unloaded pieces of road i will die and my reboot card is unobtainable because it is under the map.
sounds like your gpu might be dying? try running it on integrated graphics(if you have them). it'll have bad framerate, but it'll tell you if there actually is a problem with the GPU.