Hi guys, maybe a potential problem here, so when I first got my iPhone I turned off the Auto Brightness option and moved the brightness slider to about the half way point, that looked fine, the screen was fairly bright but last week the screen started to look a little dim so I went back into the settings and moved the slider up a bit further (to about the 75% mark), that looked like it did the week before when it was at the hal way point now this week that was starting to look a little dim too and I've had to move the slider up to about the 90% mark now and it looks the same as what the 50% mark did when I first got the phone, anyone here experienced this issue?