This has something to do with the configuration of the mobile phone itself. Generally speaking, IOS mobile phones do not have such a situation, and some Android mobile phones with low configuration will have such a situation. If the app doesn't open for a long time, it needs to connect with the cloud to go in again, so the display device is offline because the app is not connected and temporarily loses contact with the device, and the actual device is not offline. For example, when many apps enter, the content will appear after a few seconds of page buffering. In fact, it is a process of connecting with the cloud. This is related to the configuration of the mobile phone and the quality of the network. It is a normal phenomenon. Please rest assured.