Hi michaël195,
Since this is occurring with music downloaded for offline use, and when streaming, we want to isolate things a bit more. To do so, we have a few questions:
- Does this seem to occur with all songs?
- If not, does it continue when you delete and re-add the songs impacted? Delete music in the Apple Music app has those steps for you if needed.
If this seems to impact all or most songs within your library, we'd like to see if the same behavior occurs in a test user. This will also help us determine whether this is a system-wide issue on your Mac. Change Users & Groups settings on Mac covers how to set up a new user on your Mac.
"Create a new user or group.
Click the New Account pop-up menu (you may be asked to enter your password), then choose a type of account.
- Administrator: An administrator can add and manage other users, install apps, and change settings. The new user you create when you first set up your Mac is an administrator. Your Mac can have multiple administrators. You can create new ones, and convert standard users to administrators. Don’t set up automatic login for an administrator. If you do, someone could simply restart your Mac and gain access with administrator privileges. To keep your Mac secure, don’t share administrator names and passwords.
- Standard: Standard users are set up by an administrator. Standard users can install apps and change their own settings, but can’t add other users or change other users’ settings.
- Sharing Only: Sharing-only users can access shared files remotely, but can’t log in to the computer or change settings. To give the user permission to access your shared files or screen, you may need to change options in File Sharing, Screen Sharing, or Remote Management settings. See Set up file sharing and Share the screen of another Mac.
- Group: Groups allow multiple users to have the same access privileges. You control a group’s access to your shared folders by setting access permissions in the File Sharing options in Sharing settings."
After setting up a new user, you'll want to sign into your Apple ID within the Music app and enable Sync Library to access your library using the steps in Access your music library on all your devices.
From there, please test to see if you notice playback issues with music you're streaming, and music downloaded for offline use.
Regards.