Synced music fades out early in Slideshow
If you are finding that your music seems to be finishing early, then it may be because some music tracks have a long period of silence on the end.
To resolve this, make sure you have Trim End Silence setting turned on in Setup Music (under Slideshow menu). This will automatically shorten the music track back to where the music actually stops playing.
KnowledgeBase Article: Synced music fades out early in Slideshow