I think there may be. Sometimes while using the chargers they sent with the kit, I have to keep plugging it in about 4-5 times to get a full charge as the light would go out and I knew it was not fully charge just by the lack of time spent on there. Haven't had the light problem you have, but I say that there is something with the charger or the usb cable that isn't right.
Glad this worked for you.