First, check if there is a network problem. If the Bluetooth is disconnected, the phone will freeze when playing.2. Clear other bluetooth devices in the phone, restart the phone and speakers3. Check if there is an interference source next to the speaker (2.4G signal or the like). If the speaker is changed to another place, it will still freeze.4. Change to a mobile phone to play and see if it is caused by a problem with the phone itself