From time to time when I pull my iPhone out of my pocket, it starts up with a message box on the screen that says "Nothing to Undo," then I need to hit cancel to get rolling. I'm not trying to "undo" anything, and I never get this message at an appropriate time, so I haven't been able to figure out where it is coming from or why. (Happened on my 3G, now happening on my iP 4). Can someone tell me what is causing this? Any suggestions on how to avoid it? Thanks!