Hi there! I understand your FreeStyle Libre 3 app on your Android 10 device closes immediately after opening, and you've already tried reinstalling and clearing the cache. Thanks for sharing that.

Just to clarify a bit more:
- When exactly does the app close? Is it right after the initial loading screen?
- Are you seeing any error messages or just the app disappearing?
- Have you checked if your app is updated to the latest version? Sometimes the crashes are linked to certain bugs that get fixed in patches.

Meanwhile, I'll guide you through some additional steps that could help:

1. Check for App Update:
- Open Google Play Store.
- Tap on your avatar in the top right corner.
- Go to "Manage apps & device" and see if there's an update available for FreeStyle Libre 3. Install it if it is available. A recent patch reportedly fixed similar crashing issues.1

2. Force Stop and Clear Data:
- Go to Settings > Apps > FreeStyle Libre 3.
- Tap "Force Stop."
- Then tap "Storage" > "Clear Data" (this is more thorough than clearing cache). Your app data linked to the sensor should still be safe as it's stored on your LibreView account online, but just double-check you have your account login details handy to re-login after.

3. Bluetooth and Phone Restart:
- Turn Bluetooth off on your phone, wait about 10 seconds, then turn it on again.
- Restart your phone after that to refresh all connections.

4. Check Permissions:
- Make sure the app has all necessary permissions enabled: location, Bluetooth, and anything related to sensors.
- Go to Settings > Apps > FreeStyle Libre 3 > Permissions and ensure they’re all granted.

If after these steps the app still closes right away, it might be useful to try running it while your phone is in airplane mode with only Bluetooth enabled to see if any background app conflicts are causing the problem.5

Please let me know what happens with these steps or if you notice any specific error messages. I’m here to help get this sorted for you! Are you able to try these now?