Hi there! I see you're experiencing a white screen when you open the Kardia Cardiac app on your Android 15 device. Let's get this sorted out together.

To start, could you tell me if this white screen appears right after launching the app, or does it happen when you try to perform a specific action inside the app? Also, have you tried any fixes already, such as restarting your phone or reinstalling the app?

Meanwhile, I can guide you through some common steps to resolve this:

1. Close the app completely: Open your recent apps list and swipe the Kardia app away to fully close it. Then reopen it.

2. Clear app cache and data:
- Go to your phone's Settings > Apps > find Kardia Cardiac app.
- Tap Storage & cache.
- Tap Clear cache first. If the problem persists, also tap Clear storage/data (note: this might log you out or reset app preferences).

3. Restart your phone: Sometimes a simple reboot can clear temporary glitches.

4. Check for app updates: Open the Google Play Store, search for the Kardia app, and see if any updates are available. Install any pending updates.

5. Reset Network Settings: Sometimes network-related settings can cause app loading issues. You can reset them by going to Settings > System > Reset options > Reset Wi-Fi, mobile & Bluetooth. This won't delete your personal data but will reset network connections.

Could you please try these steps and let me know if the white screen issue continues or if anything changes?

If these steps don't solve the problem, I'll help you dig deeper or escalate it for further support.