UE4 Error

Fatal error: [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’)

THis error keeps crashing ue4 and i cant work on my game because of this please help.