Anyone else have problems with iOS 17.3

Just wanted to provide an update. I was still having issues syncing music. Found the below advice and this seems to have cured the issue. Link: Redownload music - Apple Support

Redownload music

Learn how to redownload music that you purchased from the iTunes Store.

Redownload music in the iTunes Store app on your iPhone or iPad

1. Open the iTunes Store app.

• • On your iPhone: At the bottom of your screen, tap More, then tap Purchased. 
  • On your iPad: Tap Purchased.

1. Tap Music. If you use Family Sharing, tap a family member’s name to see music that they purchased.
2. Find the music that you want to redownload, then tap it.
3. Tap the download button next to a song or album. If you don't see the download button, then the song or album is already in the Apple Music app.

Yes. I am now having problems with Music not transferring from my Mac to my iPhone. Certain songs, which were on my iPhone, are no longer there, yet they show as PURCHASED and are still on my Mac. When I try to add them to the playlist, I get told that I HAVE to turn on sync. I've never had sync turned on nor do I want to start now.

And I have a 12 Pro Max

Try removing then reinstalling the app. Worked for my Books on 17.3 on an iPad.