Nikon Coolpix AW100 keeps freezing up?

A few weeks ago I got a refurbished Nikon Coolpix AW100.It was working great up until about 3 days ago. When I turn it on and try to take a picture, it freezes up and nothing happens. Eventually it will take the photo, but it takes far longer than it should. So I have just been taking out the battery every time to restart it. Even then it still acts strangely, freezing and not doing as it is supposed to. Any ideas why this is happening? And has this happened to anyone else?

How long is your warranty good for on this camera?