I am also using an RPi4. If you're running the astroberry image, it's armhf, not arm64, fwiw. Architecture shouldn't have much if anything to do with it. I connect to the camera from a Windows box via Indiserver.

I don't think I saw you mention, what is the power source for your RPi? Do you have any kind of cooling set up for it? After checking all of the above and these two, I would probably pick up another Pi to see if somehow you have a hardware issue.

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