IMPORTANT: Not all mobile receiver and speaker have USB capabilities. To see if your product has the USB function described in this solution, check the specifications or the supplied operating guide. Manuals are posted on your model support page.
This may occur if the overheat protection function of the USB device has been activated due to the heat generated by charging or increase in temperature from direct sunlight. Disconnect the USB device and allow time for it to cool down before using it again.
If the problem still persists, consult the manufacturer of the connected device.