A. 1. Restart the App: Close Flacbox completely and reopen it. This can often resolve temporary glitches with lock screen controls. 2. Check iPhone Settings: Go to Settings > Face ID & Passcode (or Touch ID & Passcode) and ensure that 'Allow Access When Locked' is enabled for media controls.

B. 3. Update iOS: Ensure your iPhone is running the latest version of iOS. Go to Settings > General > Software Update to check for updates.