my iphone 4 has been giving some minor problems which i dont know if they are software or not but anyway. the problems are. my screen flashes at me when i slide to unlock it. its not a flicker its more like the screen flashes. i also have a tempermental home button. it happens rarely but it does happen enough. i thought at first it was 4.1 and still do cause i only started noticing it more after 4.1 but im wondering if its my home button just going bad. even today i hit the home button so i could slide my phone to unlock it and it seemed to not respond until 2nd click. i have restored and set up as new phone. too. my question is should i take a chance and exchange it and by now are all the phones in stores refurbs and what are chances i can get something worse? have people been exchanging and getting worse replacemet?