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Check that you are using the recommended SD card for 4K video and that you download the data after each use and format the card with the camera before each use.
Sorry, there was a problem. Please try again later.Sounds defective and you should return it at your earliest opportunity. I used mine to record about 30 minutes at 4K resolution and it worked very well. If your unit is out of warranty, perhaps you can find some help on Sony support forum.
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