A mi me sale el mismo error
Assertion failed: [File:Unknown] [Line: 198] Unreal Engine is exiting due to D3D device being lost. (Error: 0x887A0005 - ‘REMOVED’)
FortniteClient_Win64_Shipping
FortniteClient_Win64_Shipping
FortniteClient_Win64_Shipping
FortniteClient_Win64_Shipping
FortniteClient_Win64_Shipping
FortniteClient_Win64_Shipping
FortniteClient_Win64_Shipping
FortniteClient_Win64_Shipping
FortniteClient_Win64_Shipping
FortniteClient_Win64_Shipping
FortniteClient_Win64_Shipping
kernel32
ntdll
Tengo una gtx 1050 con un i3 8100 y 8gb de ram
All those errors mean that either you GPU driver crashes or if you use laptop with Intel CPU and NVidia GPU means that laptop for some reason switched to Intel integrated GPU.
Try update drivers. If oyu have a laptop make sure to set up power management settings in the way to your laptop always gonna use NVidia GPU, make sure you play with you laptop plugged to AC at least, it less likely for laptop to conserve power by switching to Intel GPU.
Also this is UE4 engine development site, for any fortnite related help contact Fortnite support: