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The NG04002 error can be caused by a variety of issues, including but not limited to:

1. Connectivity issues between the Angular Universal app and the database or other external services it depends on.
2. Memory or CPU usage spikes that cause the app to become unresponsive and hang.
3. Incorrect configuration of the IIS Node server or the Angular Universal app itself.
4. Application code issues, such as infinite loops or blocking calls, that cause the app to hang.

To troubleshoot the issue, it is recommended to:

1. Check server logs and application logs to identify any specific errors or warning messages related to the NG04002 error.
2. Monitor server performance metrics, such as CPU usage, memory usage, and network traffic, to identify any spikes or bottlenecks that could be causing the issue.
3. Check the application code for any potential issues, such as endless loops, blocking calls, or other performance bottlenecks.
4. Verify that the IIS Node server and the Angular Universal app are properly configured and all dependencies are correctly installed and up to date.

It is also recommended to consult the Angular Universal documentation and community forums for further guidance on resolving the NG04002 error and improving application performance.