Can't get my Oontz Angle 3 Plus to stay on without holding the button

When I tried to turn on my Oontz, it would turn off as soon as I stopped pressing the power button. The red light was flashing rapidly, so I tried charging it. I don't know if maybe the cord is being unresponsive, and that is why it wont stay on, cause it is uncharged, but I don't understand why it wouldn't be charging. It has never been used in water and is fairly new.

Thanks