I am curious to know, can a full sd card cause equipment to malfunction? Can the sd card just be bad? I have this camera and it worked fine and then all of a sudden lights and buttons weren't working properly. I would have no knowledge at all about the inner workings of the camera itself to even look to determine if it is the camera. I'm leaning more to the card malfunctioning. I guess to tell would be to buy a new card correct?