A. 1. Update the app: Go to the App Store, tap on your profile icon, and check for updates for Amplifon. Install any available updates as they often contain bug fixes. 2. Restart your iPhone: Press and hold the power button until you see the slider, then slide to power off. Turn it back on after a few seconds to refresh the system.

B. 3. Reinstall the app: Delete the Amplifon app by pressing and holding its icon until it wiggles, then tap the 'X'. Reinstall it from the App Store to ensure you have the latest version.