Hi There,
Welcome to Adobe Forums.
Please try and let me know these:
1) Is it happening with more than one project?
2) Please check if the output is freezing while playing it locally on the computer.
3) Please enable the Preloader and then try to publish.
4) If enabling Preloader does not help then copy the whole project in a new blank project and then publish it.
5) You can also check the output of your project on www.cloud.scorm.com
6) Which OS do you have?
I hope this will help you.
Thanks
Vikas