iOS 11 brought a lot of new features that users would need to get used to. Another update deals with Bluetooth and Wi-Fi switch that doesn’t actually turns them off.
Apple Watch 3 is experiencing issues connecting to LTE, discovered on pre-production models. The bug makes Apple Watch disconnect from cellular and connect to a Wi-Fi network. Even an unauthenticated Wi-Fi that a user hasn't connected to earlier can disconnect Apple Watch from LTE.