Why does my A7III sometimes underexpose frames completely?

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TheOats
TheOats New Member • Posts: 19
Why does my A7III sometimes underexpose frames completely?

By completely I mean that the frame is COMPLETELY black. Sometimes there is a sliver of light at the edge.

These was shot seconds apart with no changes made by me to the camera. I shoot in aperture priority mode and I use auto ISO:

I increased the exposure in post a lot on the dark image, as you can see. The other one is untouched.

This is a brand new camera and my first Sony. Am I doing something wrong? Is this a common issue with this camera?

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