Everytime I Sync my iphone to Itunes it automatically re-downloads 3524 songs to my Iphone. Why?

Hi pixel1651,

It sounds like your entire music library is syncing when you connect your iPhone. You can disable this feature in iTunes when you select Music from the sidebar in iTunes.

Open iTunes and connect your device to your computer with a USB cable.

Click the device icon in the upper-left corner of the iTunes window. Learn what to do if you don't see the icon. 

From the list under Settings on the left side of the iTunes window, click the type of content that you want to sync or remove.* To turn syncing on for a content type, select the checkbox next to Sync.

Choose the box next to Entire Music Library as mentioned in Use iTunes to sync your iPhone, iPad, or iPod with your computer

Regards.

pixel1651,

Let's use the steps below to make sure that iTunes is all up to date:

If you downloaded iTunes from the Microsoft Store

Versions of iTunes from the Microsoft Store update automatically when new versions are released.

You can also check for updates through the Microsoft Store.

If you downloaded iTunes from Apple's website

1. Open iTunes.

2. From the menu bar at the top of the iTunes window, choose Help > Check for Updates.

3. Follow the prompts to install the latest version.

If Check for Updates isn't an option in the Help menu, then you downloaded iTunes from the Microsoft Store.

You can also find those steps in this resource: Update to the latest version of iTunes - Apple Support

Additionally, you can use this resource to make sure that your iPhone is also up to date: Update your iPhone, iPad, or iPod touch - Apple Support

Should that behavior still persist, you'll want to reach out to Apple Support so they can look into this further: Contact - Official Apple Support

Take care.

A possible trigger for this is non-empty values in the Work field for tracks that don't use the Work & Movement feature. Values in here may have previously been in Grouping.

tt2

You're welcome. 🙂

tt2