Hi,
How much memory does your Pi have? I suspect 1 or 2gb, and FITS viewer is quite demanding.
I am using a 4gb RPI4 and had issues (though my images are 120mb). I have managed to get FITS viewer running by adding maximum swap and zram.
However I noticed it slowed down my sequence waiting for image to load. So I have completely deactivated it, which I advice on a RPI.
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