Project keeps crashing. Needs fixed ASAP

I am using Unreal engine 4.14 for my Honours Project and last night it crashed suddenly and i have no idea how to fix it. I was re-importing FBX files when it suddnely just crashed. I downloaded the bug reporting symbols thing to see if that would help but i have no idea what any of it means. My deadline is in a few days and i need this fixed asap.
Here is the incident report i got back
MachineId:DAA43C6748C9C85161D525A20CE6E3D6
EpicAccountId:a1b94d30a9f64cda86c581b6c074a9cb

Fatal error: [File:D:\Build++UE4+Release-4.14+Compile\Sync\Engine\Source\Runtime\Windows\D3D11RHI\Private\D3D11Util.cpp] [Line: 176]
Unreal Engine is exiting due to D3D device being lost. (Error: 0x887A0006 - ‘HUNG’)

UE4Editor_Core!FDebug::AssertFailed() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:332]
UE4Editor_D3D11RHI!TerminateOnDeviceRemoved() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\windows\d3d11rhi\private\d3d11util.cpp:176]
UE4Editor_D3D11RHI!VerifyD3D11Result() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\windows\d3d11rhi\private\d3d11util.cpp:225]
UE4Editor_D3D11RHI!FD3D11Viewport::Resize() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\windows\d3d11rhi\private\d3d11viewport.cpp:217]
UE4Editor_SlateRHIRenderer!FSlateRHIRenderer::ConditionalResizeViewport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\slaterhirenderer\private\slaterhirenderer.cpp:329]
UE4Editor_SlateRHIRenderer!FSlateRHIRenderer::DrawWindows_Private() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\slaterhirenderer\private\slaterhirenderer.cpp:639]
UE4Editor_Slate!FSlateApplication::PrivateDrawWindows() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:1388]
UE4Editor_Slate!FSlateApplication::DrawWindows() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:1084]
UE4Editor_Slate!FSlateApplication::TickApplication() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:1689]
UE4Editor_Slate!FSlateApplication::Tick() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:1481]
UE4Editor!FEngineLoop::Tick() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:2894]
UE4Editor!GuardedMain() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\launch\private\launch.cpp:152]
UE4Editor!GuardedMainWrapper() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:202]
UE4Editor!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:264]
kernel32
ntdll

Hello,

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Thanks