Problem with DNG (raw) photo

Hi everyone. I bought a Huawei P9 in May, mostly because of its camera. I found out that was possible to take pictures in raw,and found that cool. But the problem is that every time, the dng file is damaged. I wish I could post the image here but forum doesn't allow me. The image is In a bad quality and with lines over it,white and color lines. Any idea of what the problem is, and how can I solve it?

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