Green Flash on screen when unlocking iPhone 5 16GB Black?
When unlocking my iPhone 5 16GB Black. if its been off for more than 30 seconds, I get a flash of green light rise from the bottom of the screen and slightly around the edges. My first question is how common is this. My second obviously is: how big of a problem is it? Is it a fault or something that just happens? It doesn't seem to affect the screen display after this flash. But it may in the future I just don't know. It never happened with my iPhone 4.
iPhone 5, iOS 6, Black 16GB