okkkk,

so i just renamed the Mods folder so the Game is Vanilla. Playing 4k works.
renamed the mods folder so all my mods where in again. Can now play 4k with the same Mods.

idk but it fixed itself.

€dit1: NVVVMMM just crashed again
€dit2: Crashing without mods too
€dit3: "--force-opengl" is ...

factorio-current log: https://pastebin.com/V30yi2u0

€dit1: looks like my GPU driver crashs on resolutions above 1920x1080
€dit2: without mods its not crashing anymore - hmm

Version: 0.16.25 (build 35610, win64, steam)

Problem: Game crashing if i switch my game from my Main FullHD 144Hz Screen to my second screen (4k (3840x2160)) Crashing in Fullscreen and window

Specs:
I7 6700k
GTX 1080
16GB Ram

Windows error message:
(german) Der zugriff auf die Geräte Hardware ...