If the HypnoBox app closes shortly after opening, you can follow these steps to troubleshoot the issue:

1. Force Quit the App:
- On your Mac, right-click the HypnoBox app icon in the dock while holding the 'Option' key and select "Force Quit". This ensures that the app shuts down completely before trying to open it again.

2. Clear App Cache:
- Although this process is more common on mobile devices, try checking for any stored files in the HypnoBox application support folder if you're using a simulator or emulator for mobile apps. Otherwise, this step may not be applicable directly on a Mac.

3. Restart Your Device:
- Restart your Mac to clear temporary files and processes that may be affecting the operation of the app.

4. Update the App:
- Ensure you have the latest version of HypnoBox. You can check for updates from the Mac App Store or the official HypnoBox website - learn more.

5. Reinstall the App:
- If the app still crashes after updating, completely uninstall the HypnoBox app. Then, download it again from a reliable source and install it. This fresh installation can fix potential corrupted files causing the crash - learn more.

6. Check for System Updates:
- Make sure your operating system is up to date. Go to "System Preferences" > "Software Update" to check for available updates and install them.

7. Contact Customer Support:
- If the problem persists even after following these steps, consider reaching out to HypnoBox customer service for further assistance. You can find contact details on their official website - learn more.

Implementing these steps should help you resolve the issue with the HypnoBox app closing unexpectedly.