I’m having the same problem. I thought it was my iPhone 6 Plus and upgraded to the god aweful iPhone 8 Plus. I’ve had my iPhone 6 Plus since the day it was released. Last week and I tried to restored my iPhone 6 Plus thru iTunes on my iMac and the problem was still there. So I took my phone to sprint and upgraded after store employee said that it was my phone is causing the problems. After getting the upgraded iPhone 8 Plus it starts all over again. This time the phone is overheating to the point I can’t touch it and I have the lifeproof case on it also, I don’t think that’s causing it because my iPhone 6 Plus also had a LifeProof case on it, same make and color. I took the case off the phone and you can’t touch it because it’s too hot. The overheating part I think is because I’m using my phone while it’s charging at the same time.
I took my phone back to sprint and they told me it was my phone again. How can that be? I went from a 6 plus to the 8 plus and it’s still happening. The guy tried to get me to switch to the iPhone X and I told him I want my iPhone 6 Plus back and he said they don’t have any in stock and it would take 2 weeks to get another one in and the phone I gave them is already gone (I should have paid the remaining balance of $60 to keep my iPhone 6 Plus). I just don’t understand how can this be happening on 2 different devices? It has to be the iOS.
I never had this happen when I was using iOS 10, but after updating to iOS 11, that’s when I noticed the screen dimming to the point you can’t read anything. I haven’t done any updates after iOS 11.0 and that’s due to me being such a hardheaded *******.
Auto brightness is turned off, control center shows brightness to its fullest. I even went into accessibility tab in the general settings and turned auto brightness off. So far it only happens when I’m using garageband, iMovie, safari or YouTube on the iPhone 8 Plus. Before on my iPhone 6 plus I wasn’t using GarageBand but I did use iMovie only a couple of times and of course safari and YouTube, but the dimming was happening with any app I was using. I even went and uninstalled all apps to see if that’s the problem and it’s still happening. I did have problems with other apps causing problems such as crashing or freezing with my iPad 6th gen and iPhone 6 Plus but they are not on my iPhone 8 Plus at this time.
