My webpages shut down while trying to work on them after only a few minutes. Difficult to work with photos. www.galeriatrespajaros.com

The sitebuilder window comes up and says it is closing my site so can't work on it for more than a few minutes and have to reopen the site again. Constantly the window of any page I am working on freezes. Today it was my index page to just add a paragraph. I tried 3 or 4 times to get the small bit of information published. No photos involved today. Help please