Page is crashing

First of all: Great job with the catch everest theme. I don't know whats happening but i been working on my web page for over a week and i haven't finish it because, for no reason, the sistem log me out and always lose all the progress i made. I already customise my menus, widgets, the slider, background, almost everything but like i told you, i always lose all my job. Do you have any idea why is this happening? is driving me crazy... PLEASE HELP!!! This is my sample page URL: http://www.advancepyd.com/wp/