I found that for some reason, the Timescape widget is causing non-responsiveness of the touch screen. It can almost lock the phone and you could get a message that the SE home screen needs to close. If I remove the Timescape widget, I don't have any issues. Otherwise, just after using the Arc for 4 days, I must say it's a great phone. Much better than the X10, which I previously had. Sound quality is great.