Even if you have the latest Apple Watch Series 4, apps may still freeze or stop responding to it from time to time.
This means that you have to exit them manually via the Task Manager. Since the process with watchOS differs significantly from iOS, please follow our instructions on how to force Apple Watch Apps to quit.
Press and hold the side button of the Apple Watch 4 for about 2 seconds until the main screen is displayed.
Press and hold the digital crown of the watch for about 2 seconds.
This will now terminate the app that is no longer responding. If the function was successful, you will see an animation on the screen showing how the app closes on the clock.
If the problem persists when you restart the app, it will help to restart the Apple Watch. You now know how to quit an app on the Apple Watch that no longer responds.