1. Check the network connection: Make sure that the device is connected to a stable Internet network. Unstable or slow network connection will cause the video to fail to load or play normally. Try to disconnect and reconnect the network, or try to connect to another reliable network.
2. Check devices and browsers: Make sure that the devices and browsers you use support video playback. Some video formats need special technical support or plug-ins to play normally. Update the browser version, or try to play the video with another compatible browser.