Crash when lowering screen resolution

When I turn down screen resolution the game crashes and gets stuck in start screen whenever I start again. I have to reinstall (and delete all user data) to be able to start again.
Windows10 Home on MacBookAir via Bootcamp.

MachineId:7ECDB5A047279FA1D6CF05AEFB1B8CA6
EpicAccountId:

LowLevelFatalError [File:D:\Build\++UE4+Release-4.12+Compile\Sync\Engine\Source\Runtime\Windows\D3D11RHI\Private\D3D11Util.cpp] [Line: 180]
Unreal Engine is exiting due to D3D device being lost. D3D device was not available to assertain DXGI cause.


RSG_Win64_Shipping!FDebug::AssertFailed()
RSG_Win64_Shipping!VerifyD3D11Result()
RSG_Win64_Shipping!FD3D11DynamicRHI::RHICreateUniformBuffer()
RSG_Win64_Shipping!FUniformExpressionSet::CreateUniformBuffer()
RSG_Win64_Shipping!UMaterialInterface::IterateOverActiveFeatureLevels<<lambda_d0a85ea86fb8add4398ea730644af4e9> >()
RSG_Win64_Shipping!TGraphTask<`FMaterialRenderProxy::CacheUniformExpressions_GameThread'::`5'::EURCMacro_FCacheUniformExpressionsCommand>::ExecuteTask()
RSG_Win64_Shipping!FNamedTaskThread::ProcessTasksNamedThread()
RSG_Win64_Shipping!FNamedTaskThread::ProcessTasksUntilQuit()
RSG_Win64_Shipping!RenderingThreadMain()
RSG_Win64_Shipping!FRenderingThread::Run()
RSG_Win64_Shipping!FRunnableThreadWin::Run()
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