Hi! I understand your Dexcom G7 app on your iPhone with iOS 18.6.2 is unexpectedly shutting down, is that right? Could you let me know if this happens right after launching the app, during sensor setup, or while using other features? Also, have you noticed if it happens when you're connected to Bluetooth or using cellular/Wi-Fi?

Meanwhile, here are some straightforward steps we can try to get started with troubleshooting:

1. Restart your iPhone: This often resolves temporary glitches causing apps to close unexpectedly.
- Press and hold the side button and either volume button until the slider appears.
- Slide to power off, wait 30 seconds, then turn your iPhone back on.

2. Close Background Apps: Double-click the home button or swipe up from the bottom (depending on your model) and swipe away apps running in the background. Sometimes background apps interfere with Bluetooth or app performance.

3. Update the Dexcom G7 App: Make sure you have the latest version of the app installed.
- Open the App Store, tap your profile at the top right, and check for updates.

4. Reinstall the Dexcom G7 App: If the app continues crashing:
- Press and hold the app icon until it wiggles.
- Tap the “X” or choose “Remove App,” then reinstall it from the App Store.
- You'll need to sign in again and re-pair your sensor if necessary.

5. Check Bluetooth & Permissions:
- Settings > Bluetooth: Ensure Bluetooth is turned on.
- Settings > Dexcom G7: Confirm all permissions (Bluetooth, notifications, background app refresh) are enabled.

If you’ve tried these already or the problem persists, let me know. I can then help with some deeper troubleshooting like examining app logs, checking for iOS restrictions, or looking into your account setup.

Does this make sense so far? Would you like to start with these steps?