Larry
I haven't had the booting problem you've experienced. Maybe because I haven't used Favorites. Nor, will I use Favorites until the issue is addressed. But, I did write Yamaha about getting multiple error messages requiring shutting down, rebooting and having to delete the apparent registrations that triggered the error. Based on PSR Tutorial posts, others have also experienced the same problem. Desmond responded to me, much the same as he responded to you. It didn't feel like a serious concern to him.
Ed