This usually happens when areas of the card are corrupted. Pictures cannot be saved to those portions. Is your card old? Have you ever removed the card from your computer/card reader or disconnected the camera after downloads and forgot to use the "safely remove hardware" function?
Testimonial: "Your answer is logical! The card's not real old, and showed plenty of room. After I deleted some older images on it I was able to shoot/store again."
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