Digital Editions stop responding when connection ereader

I have used Digtial Edition with this ereader (Letto) many times before without problem. Now I have downloaded a book and opend it in Digtial Edition and so far so good...

As soon as I connect the ereader to my computer Digital Edition stops responding.

I have installed the latest version, didn't work.

Uninstalled, cleared the register and deleted folders under my documents and the installed again.

Logged in and downloaded a book, worked fine. 

Connected my ereader and Digital Edition stoped working.

My ereader works fine and I can access it from my computer and it has worked fine in Digital Editions before. I manged to copie the book to my ereader manualy from explorer insted. 

I recently updated Windows to the latest version of Windows 10 if that has anything to do with it.

Running Win 10, version 1903, OS-version 18362.418