I think I've narrowed the issue down to the Fire Tablet. If I stick to my Echo and Audible on my Android phone, syncing seems to be pretty straight-forward, non-finicky and very consistent. It's only when I add the Fire tablet into the mix that things get a little squirrelly.
I listened with the Fire Tablet yesterday evening, then switched to my Echo after going to bed (setting a sleep timer). All seemed well with that. The next morning, I used Issy's technique for telling Echo to back up until I found the spot where I fell asleep. I then listened for a while longer this morning and stopped on a chapter break. Easy-peasy.
Then later this morning, I picked up my Fire tablet, launched Audible and started the book like I normally do--only it was still at same the location as my previous night's Fire listening session. I did not get the "Audible is picking up where you left off on another device" message. After forcing a sync, there still was no change. I had to manually move to the chapter I knew I'd stopped at earlier.
I don't want to eliminate the Fire tablet from the mix (because it's so much better on battery than my phone). I'll have to keep fiddling, I guess.
Thanks for the input!
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