I got an iPhone 4 (CDMA) today. It always shows like 3-4 bars, but its constantly flipping between 1x and 3G modes.... maybe every 30 seconds or so. I also have a Motorola Barrage through Verizon, it has no 3G issues at the same location. I already tried hard reset, PRL update, etc.. any ideas? I could see the flipping behavior when its down to 1 bar or something, but why is it flipping with 3-4 bars on the display?