After unlocking the screen Bixby Voice home is shown
Samsung is aware of this symptom which may appear on some Galaxy Note9 devices. If you have been accidentally triggering the Bixby button on AOD (Always On Display) or lock screen, Bixby Voice home may be shown after you unlock the lock screen.
This issue has already been resolved with an application update. Please update Bixby Voice application (220.127.116.11 or higher version) from app’s own update menu.
Follow the steps below:
Samsung encourages users to keep software and apps updated to latest version, please check and update regularly.