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There could be multiple reasons why the Next.js server is stopping within a few seconds after executing "npm run dev."

Some of the common causes are:

1. Port already in use: The port used by the Next.js server might already be in use by some other application. In this scenario, you need to change the port number by modifying the Next.js configuration file or by stopping the other application.

2. Missing dependencies: If some of the required dependencies are not installed or are corrupt, then the Next.js server might stop functioning. You can try running "npm install" to install the missing dependencies and then try to run the server again.

3. Memory limitations: If the server is consuming more memory than what is available, then the server might stop functioning. You can try increasing the memory allocation for Node.js by setting the "--max-old-space-size" flag to a higher value.

4. Code error: If there is an error in the server-side code, then it might cause the server to stop functioning. You can check the console logs to identify the error and then fix the code.

5. Operating system limitations: Some operating systems might have limitations on the number of files that can be opened by a process. If the Next.js server tries to open more files than the limit, it might stop functioning. You can try increasing the limit by changing the operating system settings.