To verify if error is present, just make a capture sequence of 100 subs a 1 second. it usually fails within that somewhere. I have the issue on all my Sonys: a7 and two a5000 so it definitely is not a HW error.
The man behind StellarMate has debugged the problem logged into my system and recreated the problem. He has raised the issue with the maintainers of GPhoto2. He also made a patch to my system that fixed the problem for me. I just cannot upgrade anymore before the problem is solved in the releases. In the meantime it would be nice if someone made a detailed description of the installation of the patch...

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