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Summary: Learn effective solutions to resolve the `Unreal Engine Exiting Due to D3D Device Being Lost` error in Unreal Engine 4 using these troubleshooting steps.
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How to Fix the Unreal Engine Exiting Due to D3D Device Being Lost Error

If you’re working with Unreal Engine 4, you might encounter the frustrating "Exiting Due to D3D Device Being Lost" error. This issue tends to interrupt development or gameplay, causing the engine to crash. Thankfully, there are several troubleshooting steps you can take to resolve this problem.

Update Your Graphics Drivers
Outdated or corrupt graphics drivers are a common cause of this issue. Make sure your graphics drivers are updated to the latest version.

NVIDIA Users: Go to the NVIDIA website or use the GeForce Experience app to update your drivers.

AMD Users: Visit the AMD website or use the Radeon Settings app to perform the update.

Check Your Hardware
Ensure your hardware meets the minimum system requirements for Unreal Engine 4. Overclocked components, particularly the GPU, can also cause instability. Consider reverting to stock settings to see if the error persists.

Modify Project Settings
Adjust certain project settings to ease the strain on your GPU. Consider altering the following settings in your project:

Reduce Quality Settings: Lower the graphics settings in your project. Navigate to Settings > Engine Scalability Settings and reduce the quality.

Reduce Resolution: Lower the resolution at which your project is rendered.

Disable GPU-Based Features: Turn off features like Ray Tracing and Virtual Shadows.

Adjust TDR (Timeout Detection and Recovery) Settings in Windows
TDR settings play a role in how Windows responds to a GPU that appears to be unresponsive. Increasing the TDR delay might prevent this error.

Press Win + R and type regedit to open the Registry Editor.

Navigate to HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\GraphicsDrivers.

Create a DWORD (32-bit) Value named TdrDelay.

Set TdrDelay to a higher value (e.g., 10 seconds).

Note: Modifying the registry can cause serious issues if not done carefully. Always back up your registry before making changes.

Disable Antivirus Software
Sometimes, antivirus software can interfere with Unreal Engine. Temporarily disable your antivirus program to test if this resolves the issue.

Update Unreal Engine
Make sure you are running the latest version of Unreal Engine. Updates often include fixes for known issues and improvements.

Check for Overheating
Monitor your GPU and CPU temperatures. Overheating can cause your system to become unstable, leading to the D3D Device Being Lost error. Ensure proper cooling and ventilation.

Verify Engine Installation
Corrupted engine files might be another reason for this error. Use the Epic Games Launcher to verify your Unreal Engine installation:

Open the Epic Games Launcher.

Navigate to the Library tab.

Click on the Unreal Engine version that you are using.

Click on the three dots (···) and select Verify.

By following these steps, you should be able to mitigate or completely resolve the Unreal Engine Exiting Due to D3D Device Being Lost error, allowing for a smoother development and gameplay experience.

Happy debugging, and may your Unreal Engine projects remain stable and high-performing!