Facer on Android phones offer the ability to "shuffle" a collection of watch faces and get them synced to your smartwatch at regular intervals.
In some cases, this functionality might stop working due to Android phones killing applications in the background. To disable this behavior and ensure the shuffle feature is functional, we recommend following the guidance for your specific phone model at https://dontkillmyapp.com/
Once this behavior is disabled on your phone, the shuffle functionality should work as expected.