Audio book issues

I love this app and listen almost daily, but over the last several months, about every third or fourth book the audio portion will not give you the option to download. I have found that if I delete the book, delete the app and re download everything, it will usually pop up and let me download the audio portion of the book. It is frustrating and if Im not in a wifi spot, I use more data. I cannot find anywhere to contact kindle/Amazon for assistance with this issue.

Jennbailey about Kindle – Read Books, eBooks, Magazines, Newspapers & Textbooks, v5.13.1