If the FLIR Cloud App on your phone opens and then immediately closes, follow these steps to troubleshoot and resolve the issue:

1. Restart Your Device:
- Power off your phone completely and turn it back on. This helps clear temporary glitches that may affect app performance.

2. Update the App:
- Ensure that you have the latest version of the FLIR Cloud App installed. Visit the Google Play Store or Apple App Store, search for the FLIR Cloud App, and check for updates.

3. Check App Permissions:
- On Android devices, sometimes app permissions need to be manually enabled. Go to Settings > Apps > FLIR Cloud App > Permissions, and ensure all necessary permissions are granted - learn more.

4. Clear App Cache & Data:
- Clearing the cache can help with app performance. Go to Settings > Apps > FLIR Cloud App. Tap Storage, then tap Clear Cache, followed by Clear Data. This action will reset the app settings and may resolve the issue.

5. Reinstall the App:
- Uninstall the FLIR Cloud App from your device. Go to your app store and download it again. This can help fix issues caused by corrupted files.

6. Check for Operating System Updates:
- Make sure your phone's operating system is up-to-date. Go to Settings > System > System updates and ensure you have the latest updates installed.

7. Factory Reset Your Camera:
- If the app still crashes, consider doing a factory reset on any connected FLIR camera. For the FLIR One USB version, hold down the power button for 10 seconds. Follow the specific reset instructions for your camera model if needed - learn more.

8. Contact Support:
- If none of the above steps work, reach out to FLIR customer support for further assistance. Prepare to provide details about your device and the troubleshooting steps you've already taken.

Following these steps should help you resolve the issue with the FLIR Cloud App crashing on startup. If the problem persists after these measures, it may indicate a deeper compatibility issue that needs to be addressed by FLIR's technical support team.