I make sure that all jobs have completed and then eject via Calibre. I click the arrow next to the device icon and click eject this device, so I do try to be careful and kind to it.
I just found the setting about Manual/Automatic/Only on Send metadata management and I thought I had it. I switched from manual to Automatic and the first time I unplugged and plugged back in it worked! Calibre read the file and was able to show which books were already on the device. But then I added more, ejected, waited for import, reconnected and this time, the metadata.calibre file reverted to when I had just the first batch. ughhh.
I tried again with it set to Only on Send, but same issue.
I'll give epubcheck a try though. Thanks for the suggestions!
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