I posted this earlier today and now can't find the post. Sorry if you've already seen it. Here we go again:
I just purchased a 350 for the sole purpose of getting epub library books (I have a Kindle for everything else). The first book that I downloaded worked fine, with the "Do not disconnect" sign vanishing when the book was downloaded from the computer to the device. Today I downloaded two more books (at separate times). Each time the "Do not disconnect" sign stayed on for quite a while (5 minutes or more). In exasperation, I disconnected (gasp!), and the books were on the device.
What's up with this? How do I know when the book is finished downloading?