Hi Jose Arroyo2,
I would start by using this article to troubleshoot the issue:
If that does not resolve it, some general troubleshooting may help isolate or resolve it:
If that article does not resolve it, there are steps in this article that, although the symptoms are different, would also be worth trying:
Since iTunes 11.0.5 I have problems that iTunes randomly freezes and eats up all my available RAM (almost 10GB)... If I don't force quite iTunes then, it leads to a spinning beachball of death....
Unfortunately your solutions are not working, I tried every single one... I guess it's a bug... I will try to downgrade the iTunes version.