A7iii shutter broken by it self looked like ripped off?

[Ertan]

Hello, I just turned in my camera to service. I was taking photos and some where coming out over exposed when correctly exposing. And over 2000 shutter I could see the curtain or shutter at the corners as shadows or black areas. At 5000 speed and over the photos where completely black sometimes

So after handing to service they sent me a picture and said out of waranty because I may have caused it. Such as taking a photo while cleaning sensor.

I haven't even put my figures in to that gap before. And never cleaned the sensor. 

Here is the photo.

What may have caused it. 

I am shocked when I saw it. No one else have used my camera too. I will test my camera before reparing it to see if I still get the same result when taking a photo. This way I will be sure that if the service has caused it...

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