Thanks for all of your suggestions.
I know yesterday when I checked the Disk Utility my Kobo was NOT there, for sure. I will try some of the other things you mentioned. This is really frustrating, because I did have it work for me at least twice and thought I had it fixed.
I only have 2 USB ports, and I regularly try both. I have tried 2 different USB cables, including the one that came with my KA1, but neither have worked. Buying a new USB cable seems pointless since the official cable is what I am using, plus, I know the cable works in other computers, just not my Mac.
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