What is wrong with my Ipod charger?

Ok so I have an iPod 5 latest version and the problem is is that my charger won't work. The first time this happend was about 2 weeks ago. The problem was that when i plugged in my Ipod to charge it wouldn't charger or do anything, when i plugged it into my adapter the light on the adapter would turn off, but when i would unplug the charger it would turn back on. So i eventually bought a new charger and it started working fine for about a week and now it is doing the same thing as my other charger it just wouldn't work. Is there something wrong with my iPod that makes the charger do that, the adapter? I just really need hep with this please? Thanks