Mambo-mano

Question

I download my mp3 files about 67 of them. I push the play button it plays one song then it says error
if I change the song before it ends then it keeps playing I do not have time to push next song before the 1 is done playing especially when I am on the road. It did not do this in the begining
also I need another usb cable.....
It is two hard to unplug the usb cable from my computer and plug it into the charger and visey versa.
Do I need a mambo-mano usb audio player file for backup ????
I have other simular usb cables that fit but they do not work.
please e-maol me with your solution [e-mail]