Hi all, Last Sept I did a 1-to-1 replacement iPhone 6 due to a swollen battery on the previous 6. Lately when I boot up the replacement phone(as it was a spare phone so I didn't use it often), the phone would boot up with a Apple Logo and the image will either slowly fade black or turn white completely. The phone does give off the charging and lock sound after it boots pass the Apple logo like a normal iPhone but will just show a blank image with the backlight on. If I were to leave the phone charged and in locked state for more than a minute, when I click the home button, the display will suddenly work and show the home screen and respond to my touches like a normal phone. Does anyone know if this is a display or iOS software related issue? Thanks in advance!