Yeah I thought it was a memory issue but after a reset and fresh phone and no difference and then all the folks having the same issue I realized its not my Phone..
but is it the launcher that is restarting or the phone itself? If it's the launcher it won't matter if it's a fresh phone if you are using the same app that is causing the launcher to be killed in memory to free up memory for that app you're using. If you're booting up the phone and using the browser or doing some menial task the laucher should not be getting killed in memory but if you're using a fresh phone and watching a flash video, have a bunch of tabs open in your browser or open a game like Peggle I can almost guarantee it will reboot the sense launcher especially if you haven't just restarted the phone itself.