finepix Z2 fault with charging through dock?

I have a fujifilm finepix Z2, its a great camera for me, but recently when charging through the docking cradle the red light on the camera came on for about 10mins then switches off. i take the camera off and put it back on the dock again and the red like comes on, but goes off after a min. So the camera is never fully charged and the green light for fully charged never come up, can you help?