My Desire has restarted itself a number of times automatically. Twice it restarted when I powered it up. It powered up and then restarted. Three times, it restarted while I was using the Navigation app. I wasn't actually using the turn by turn navigation. I started it and just started up the map. It worked for about a minute and then the phone restarted. The restart while the Navigation app was running happened twice today. Has anyone had similar experiences? Do you recall what you were doing when it restarted?