the next time i ran it it crashed and i got this
Assertion failed: [File:D:\Build\++UE4\Sync\Engine\Source\Runtime\Windows\D3D11RHI\Private\D3D11Util.cpp] [Line: 198] Unreal Engine is exiting due to D3D device being lost. (Error: 0x887A0006 - 'HUNG')
Warriorb!FWindowsErrorOutputDevice::Serialize()
Warriorb!FOutputDevice::LogfImpl()
Warriorb!FDebug::AssertFailed()
Warriorb!FDebug::AssertFailed()
Warriorb!FRHICommand<FRHICommandSetBlendFactor>::StoreDebugInfo()
Warriorb!VerifyD3D11Result()
Warriorb!FD3D11DynamicRHI::GetQueryData()
Warriorb!FD3D11DynamicRHI::RHIEndDrawingViewport()
Warriorb!FRHICommandListExecutor::ExecuteInner_DoExecute()
Warriorb!FRHICommandListExecutor::ExecuteInner()
Warriorb!FRHICommandListExecutor::ExecuteList()
Warriorb!FRHICommandList::EndDrawingViewport()
Warriorb!FSlateRHIRenderer::DrawWindow_RenderThread()
Warriorb!TBaseRawMethodDelegateInstance<0,FSlateRHIResourceManager,void __cdecl(void)>::ExecuteIfSafe()
Warriorb!FNamedTaskThread::ProcessTasksNamedThread()
Warriorb!FNamedTaskThread::ProcessTasksUntilQuit()
Warriorb!RenderingThreadMain()
Warriorb!FRenderingThread::Run()
Warriorb!FRunnableThreadWin::Run()