Comment 15 for bug 1906152

Yeah there is nothing useful there, as I suspected. One other thing you
can try, is changing th elocation of the calibre temp directory. By
default it is in /tmp and macOS stupidly deletes things from /tmp after prolonged
inactivity, which can break calibre. Set the CALIBRE_TEMP_DIR
environment variable as described here https://manual.calibre-ebook.com/customize.html#environment-variables
to some directory other than /tmp