a6500 exposure malfunction. Answers/solutions?

[dansteph]

I purchased a Sony a6500 last December and I've loved using it (aside from the battery life). So far, I've used it quite a few times to conduct interviews for short documentaries or promotional work. I've conducted many interviews without issue, until now. Since I'm often working alone, I set the camera up, adjust the exposure and focus properly, and then move away from the camera to sit down and ask questions after pressing record - I always shoot interviews in complete manual mode for ISO, aperture, and shutter speed. This time I was using the Sony G- f4/18-105 lens, it was very cloudy so I had the aperture set at (f4), shutter speed around 1/200ish, and ISO I always keep as low as I can at 100. When I pressed record, the interviews were properly exposed, slowly throughout the image became brighter and brighter. By the 9-min mark, the image is so over-exposed that it is useless, and I discovered this when uploading to my computer. Is this some kind of manufacturer malfunction, is it common, or am I now unknowingly doing something drastically wrong that I wasn't before? I've attached a couple screen shots of the moment I pressed record, to the moment I stopped recording - 9:16 to show you how drastically the exposure changed. Thank you for taking the time to help out!

 

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Thanks again,

Dan