How to stop my iPhone from automatically syncing?

Every time I connect my iPhone to my computer my iTunes pops up and it automatically syncs all the music from my iTunes library to my iPhone. I have already selected the "prevent auto syncing" box in the device section from the iTunes preferences tab. Why does it keep doing this? How can I stop it?

1. Before you plug the iPhone or iPod into the computer, go to iTunes.

2. On a Mac, go to the iTunes menu -> Preferences -> Devices.
On a PC, go to Edit -> Settings -> Devices

3.In the pop up window, look for the icon or tab that says Devices. Choose it.

4. Just below the box, you'll see a checkbox reading "Prevent iPods, iPhones, and iPads from syncing automatically."

5. Check it and click OK at the bottom of the window.

Auto-sync is now turned off and you're safe to plug your iPod or iPhone into the computer.

Check that you have the latest version of iTunes and then confirm the settings for prevent automatic syncing again, is it running a sync or a backup?

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