Zombie
Go to settings, Lyrics and PDF, Autoscroll Settings, Autoscroll Lyrics, ON
Auto scroll gets disabled if you touch the lyrics screen , perhaps you’ve done that , you can enable it again, or it will automatically be enabled if you use stop start.
If this is not your problem, can you give us more information.
Also, if you have text only without a backing track or a set time duration the auto scroll won’t work as it has no time to work to.