Just wondering if this is a common occurrence with the iPhone. I just got the iPhone 4 and the only annoyance that I have found thus far is sometimes when the phone is locked and the screen is off, when I press the home button, the screen flickers but nothing pops up on the screen (no unlock screen). I have to press the home button again to get the screen to come on. When this happens, and I unlock the screen, the screen rotation feature doesnt work. I have to do a hard reset to get this feature back. Is this common, or am I experiencing something that calls for a trip to the genius bar?