I have audiobooks in MP3 format on a USB Thumbdrive and the Sony/Sync system has not been retaining the paused location when we shut off the car. We usually pause it while driving, park, and shutoff the car. When we return it has forgotten both the file we were listening to, and even the book. Each book is in a folder with multiple files. Since the Sync device does not have FF and FR, I have cut the books up into 10 minute segments/files anticipating this might be a problem. And sure enough, it is! Any tips on how to have the system start playing where it left off?