Thank you for providing the details of the issue you are experiencing with iTunes pausing when playing music.
I recommend reviewing the following article to see if any third-party plug-ins could be causing the problem:
I also recommend verifying that your software is up to date. You can check for updates by going to Apple () menu > Software Update…
You can find more information here:
If the issue persists, I recommend reinstalling iTunes:
Thank you for using Apple Support Communities.