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The SD card may be defective,
If you are using a SD card to record your videos, please remove the card and connect it to a USB Card reader, then connect that card reader to your computer's USB port and see if your files are there. That way you can recover your videos.
If you don't have a SD card reader, you can buy it from here (they are very cheap) ===> USB SD card reader
Then let me know if you could retrieve your videos.
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Thank You and I wish you all the best. GOD Blessings!!!