I don't have anything constructive to offer, but I'm also getting an "error communicating with device" message at Calibre when I connect my H201. However, everything seems to be working still, at least so far, in terms of adding books and shelving them. I did try deleting all books I added in the past few weeks just in case one was corrupted.
I'm still running 3.19.5761 on the device. My other Kobos with later firmware aren't exhibiting this issue.
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