Today… after reinstalling windows (F*** yes…)
I finally managed to get a crash report:
LogD3D11RHI:Error: Direct3DDevice->CreateBuffer(&Desc,pInitData,VertexBufferResource.GetInitReference()) failed
at D:\Build++UE4+Release-4.12+Compile\Sync\Engine\Source\Runtime\Windows\D3D11RHI\Private\D3D11VertexBuffer.cpp:75
with error DXGI_ERROR_DEVICE_REMOVED
As I dont have any clue on what # the submitted error report will be, I will add the crash log dumps here as well: