Hi,
Sorry but I don't know why that is happening. It happened to me visiting your site on the first request, but after refreshing the page it worked fine navigating around your site. I would clear the mojoportal error log and then start checking it right after the symptom occurs to see if any error gets logged or if it corresponds to the application recycling (which is logged). One possible guess is because godaddy is cheap hosting, maybe you have barely enough memory available andn if it runs out of memory it will recycle the app.
Hope it helps,
Joe