1. First, wait until the pictures you took are recorded on the memory card. Then, turn the camera OFF and remove the memory card. Check if the memory contacts aren't dirty and reinsert the memory card.
2. Be sure to use a memory card of the appropriate standard and speed class. We recommend using the highest speed class for the best performance.
3. Your memory card might have some file system errors. While inserted, use the camera function "Restore Image Database" and see if it improves responsiveness.
4. If your camera has two memory card slots, the overall reading and writing speed may be limited by the speed of the lowest card inserted. Ideally, both cards are of the same speed class.
5. It's possible that your memory card is faulty and is causing the camera to freeze up. Use a different memory card to confirm this possibility.
6. A software glitch might cause poor camera performance. Remove your memory card first, and then remove and reinsert the camera battery. If this doesn't help, try to reset the camera to the factory settings (initialization). Consult your product manual if you're unsure about the reset procedure.
7. If you use SD/SDHC/SDXC cards, make sure that their write-protect switch is not in the LOCK position.