My sync library will not stay on

Hello TaeHill86,

Welcome to Apple Support Communities. We understand your sync library setting isn't staying enabled. We have some suggested steps to walk through that should help resolve the issue.

First, we recommend making sure your iPhone is up-to-date:

Update your iPhone, iPad, or iPod touch 

Next, close your Settings and Apple Music app then restart your iPhone:

How to force an app to close on your iPhone, iPad, or iPod touch 

Restart your iPhone, iPad, or iPod touch   

If the issue persists, check out the additional steps in this article:

If an app unexpectedly quits, stops responding, or won’t open

Keep us updated with how it goes.

Take care.