Don't know if this helps, but it doesn't seem all random.
I've got a feeling that the crashes normally happens where there is image capture activity of some kind, either when changing between flat frames to light frames or when there is an interruption by e.g. a meridian flip and the solver needs to capture some images.
Also in the output I provided in the previous post there are statements like "ISD::CCD::loadImageInView".
Could it be something in this area?

BR,
// Åke

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