My speaker did this. I was able to fix it by resetting the speaker. Plug it in, and let it charge for a while, just to make sure it has really does have a charge (like half an hour, minimum). Then hold down the minus button, and the power button for about twelve seconds, until you get a beep. That's all it took for the speaker to start up correctly. After that, I did have to forget the blue tooth device, and reconnect new. I don't know if that is part of the process.