So over the Audible app.
Back in March it wiped 24 hours off my listening stats. Yesterday, it wiped absolutely everything. Badges, milestones, listening time. Not that it really matters in the grand scheme of things, but I quite liked it. Now, it may as well just be a reading app - anything could read a book out to you. The app hardly has any other features.
It seems to be the app not the phone, as it's happened on two different phones now, one brand new. Last time the suggested fix was to reinstall everything, which meant re-downloading the audiobooks I'd been listening to. Doing that didn't fix the problem.
So, not much can be done, but not a shining example of app development from a company who can afford to do better. *rolly-eye emoji*