Please use this thread going forward: Write Song / Book / Lyrics Loses Progress | EA Forums - 4973703
Same thing is happening currently in my game when I'm trying to write songs for both guitar and piano, and also song lyrics. My sim loses progress any time I have them stop to do something else (like eat, sleep, and use the bathroom, or go to work - you know, life). I tested it and had them write all day and by the time the progress bar got to the end, the task never completed and my sim doesn't finish writing the song. And yes, I'm resuming my songs from my inventory.
I have the same issue with writing books, but am using a mod to fix that issue because it's just so dang irritating.
I have been having the same issue with the new update. They never finish the book no matter how long they have been working, and all progress is lost when travelling.
