Is it an error to show up the main screen during browsing internet?

Is it an error to show up the main screen in the midst of browsing internet with Safari as if I push the Home button?
I reset iPhone but the same thing repeated. And I finally restore my iPhone to the original firmware with iTunes. But the same errors! Could anyone help in this problem?
iPhone    

I think that means Safari crashed. Maybe you are
going to a web page that it can't handle. Does it
happen at the same web page? What is the page?
It's happening randomly. When I rebrowse the web page previously crashed, it's fine this time without problems. It's unpredictable. Version 1 has a lot of problems always. I have used iPhone one week in frustration.
iPhone

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