1. Most likely, the focus mode or other shooting settings may not be correct for your shooting scene. Here's an article on blurry pictures that offers tips that may help.
2. If you successfully ruled out settings or usage causes and use a camera with an interchangeable lens, try a different lens to confirm if the lens causes the issue.
3. Finally, try to reset the camera to the factory settings (initialization). Consult your product manual if you're unsure about the reset procedure.