Libra Colour problems with new kobo

[alita]

Hi, I bought the Kobo Libra colour a few months ago, and I'm having trouble with it. Once I connect it to calibre (which I've used with my previous kobos) calibre puts up a message to say it can't communicate with the device and it won't show books on it. I can still add books, but once I've disconnected, all of my books are marked Unread, even the one I was reading at the time, and all the books are in the wrong order. So a new book might be on page 5 of the kobo, instead of at the top. I have the sort order to recent, so I don't get it. Is this a problem with Kobo? Isnt it compatible with calibre? I've downloaded every calibre update. I can temporarily fix the problem by resetting my kobo to factory settings and completely wiping it, but the fix doesn't last long.

Has anyone any ideas to sort this out? thanks.