Hi there! I understand that the Signia App has frozen on the volume screen. Let's work together to get you back on track.

1. Force Close the App: Start by force-closing the Signia App. You can do this by double-tapping the Home button (or swiping up from the bottom of the screen if your iPhone doesn't have a Home button) to view your open apps. Then, swipe up on the Signia App to close it.

2. Restart Your iPhone: Once the app is closed, restart your iPhone. This can help refresh the system and resolve minor glitches. To restart, press and hold the side button until the "slide to power off" slider appears. Slide it to turn off your device, and then press the side button again to turn it back on.

3. Check for Updates: After your iPhone is back on, check if there’s an update for the Signia App. You can do this by going to the App Store, tapping on your profile icon in the upper-right corner, and then scrolling to see if the Signia App appears in the list of updates.

4. Reinstall the App: If the app continues to freeze after updating, reinstalling the app can often help. To do this, press and hold the Signia App icon until it wiggles, then tap the "X" to delete it. After it's deleted, go back to the App Store and download it again.

5. Try Disconnecting and Reconnecting Your Hearing Aids: Sometimes, disconnecting your hearing aids from Bluetooth settings and then reconnecting them can resolve issues with the app. Go to Settings > Bluetooth, find your hearing aids, and tap “Forget.” Then, reconnect them by following the pairing steps in the app.

Please try these steps, and let me know how it goes! Are you satisfied with the solution I provided?