When I started the Camera app yesterday, the image of the closed shutter (I dont know the proper term - iris? diaphragm?) appeared on the screen and stayed there. I couldnt change from still camera to video, couldnt adjust the flash from the auto setting, and when I pressed the home button, the iP4 wouldnt return to the home screen. After I shut it down and restarted, I was able to take the photo. It locked a second time later in the day. This is my 3rd iP4. The first had 3G Data reception problems, the second had severe Proximity Sensor problems, and now this. The serial number on this one starts with 5K, so I believe that its a refurb. To all of you My-iP4-is-Perfect people, I wish I could get a flawless iP4 like you have. Please don't post unless you have something constructive to add. It just wakes the Trolls. My question is: Do you think it is software or hardware related? The iP4 is on 4.0.1 and JBd but I have not installed anything beyond the JB.