recently when i would turn the camera on it would tell me that I needed batteries. I replaced the batteries and it continued to give me the same message. After putting in a whole package of new batteries, the camera persisted in giving me the same message. I didn't try to use the camera for about three weeks. After then, I turned the camera on and it was fine, then after several pictures, it began to give the same message. Is there some type of reset button or is the camera not usable anymore?