Audible app failing to download titles completely.

So, i've been having issues with the Audible app failing to download titles completely. I'll be reading the book, and then quite of the way through, the ook will stop playing, and an alert will come up saying that I need to resume the download. It's like it only gets part o the book when I hit the download button. I'm not sure what's going on. I don't think it's my wifi, as I've downloaded podcasts without too many issues. Is there any way that I can resume the download without deleting the book and redownloading it entirely? I'll admit, I haven't tried redownloading. Has anyone slese had this problem with the Audible app? This is really frustrating, and if anyone has a solution, I would be extremely grateful! Thanks, Shersey