You may try to by a USB wall adapter. Your problem occurs to me a lot. It may be your computer. Also, if you are charging it on the computer, make sure it is a USB chord made by Apple. Sometimes if you buy a universal charging chord, it only charges in the wall, not on your computer. Your computer cannot read the universal chord because the chord is not meant for a computer to read it.

If that does not work, then it may be the battery or port. If my advice does not work, replace the battery. If that does not work, take your iPod to the Apple store.