User Activity

When I try to connect my device to my laptop there is some error occurs, PC shows "can't connect to this network", and my PC is able to connect with other devices except "Galaxy S8+" and this device is also not able to connect with other phones. Plea...
When i go to background that is skip any app, and when i go back to the same app it starts from over rather resuming.Why? Please guide me. thanks for reading!
Why doesn't my lock screen wallpaper categories updating, on Samsung Galaxy SM j600F