You should have really fast card to avoid this problem. I have not seen this issue after switching to a card with 300 Mbps write speed. But not sure if that was the root cause.
Also, I have ALWAYS inserted the card for reading the images in READ MODE ONLY.
I find when I look at my images on the camera (evf and lcd) and in Fast stone they look good. When I load them into Affinity Photo they are underexposed. This might be an Affinity Photo issue. Are you finding similar? I also have Dynamic Range set to 400, would that cause this? Maybe I need to check with Affinity Photo on their software and compatibility with Fuji RAF.
Is it possible to save a 4K image from a video recorded with a Fuji X-T3? In the camera or outside the camera.
I mean except for pausing the video on the computer and take a screenshot which is not 4K on my computer.