I just upgraded to 2.0.47 yesterday and have had this error appear 3 times since. I am unable to duplicate it at will. I have only been in the Map Editor this whole time.
I have played this game with more than 3000 hours with no issues until this upgrade. I have not done any upgrades to my system in a while that I could look there. I did try rebooting like the error suggested.
I have attached the logs and a screen shot of the error. Below is a subsection leading up to the error:
1216.041 Info AppManager.cpp:323: Saving to _autosave2 (blocking).
1217.698 Info AppManagerStates.cpp
1631.711 Info SteamContext.cpp:683: Steam connection lost.
2117.772 Info AppManager.cpp:323: Saving to _autosave3 (blocking).
2118.943 Info AppManagerStates.cpp
3019.023 Info AppManager.cpp:323: Saving to _autosave1 (blocking).
3020.286 Info AppManagerStates.cpp
3920.273 Info AppManager.cpp:323: Saving to _autosave2 (blocking).
3921.547 Info AppManagerStates.cpp
4232.592 Info SteamContext.cpp:683: Steam connection lost.
4342.983 Info SteamContext.cpp:683: Steam connection lost.
4596.476 D3D11_ERROR: IDXGISwapChain::Present failed in swapBuffers on line 1949. Error [0x887a0005] - DXGI_ERROR_DEVICE_REMOVED
4596.476 GetDeviceRemovedReason(): [0x887a0006] DXGI_ERROR_DEVICE_HUNG