1. Check whether the speaker has power, you can plug it in for a test
2. If you use Bluetooth to play on your mobile phone, you can disconnect Bluetooth and reconnect, or you can restart the speaker and playback device, or replace it with another mobile phone for testing
3. Replug the USB flash drive or audio cable to make sure the interface is in good contact
4. If it is a video speaker, the network speed may be too slow, you can try to switch to other networks
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