Illustrator close automatically (asking me to save the changes) after i use an effect.

Hi, 

a new total random problem arose, from night to day without me messing up with preferences illustrator sign me out (asking me to save the changes) after i do a number of actions. In this specific case I am applying a shadow with a blur effect, at the moment of acepting the changes and applying it,  the singout widow appear and force me to close the app. 

Any help is appriciated.

cheers and thanks