Well, I've read a bit more. A couple of things to try;
-ensuring that the Kobo is unplugged from computer using the 'safely remove' feature
-making sure the folder directory that opens when kobo is plugged into the computer is closed when making changes
Those 2 ^^ things helped some people when these errors started happening last year.
Also, Kobo just released a new firmware version [yesterday I believe], and very recently Calibre had a new release as well. I've downloaded both of these, and I tried out my Kobo today, with new purchase and changing some of my metadata, and all seemed to work, so far *knocks on wood*.
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