Until yesterday everything was fine. Something changed though not sure how/why. I have my brightness set to a certain level. But my phone brightness display keeps going on Auto mode and keeps going darker. It also keeps turning off Wifi, I'm assuming as a result of the same glitch. I keep fixing this, it keeps reverting. This is within a minute or two. What on earth is going on? FYI I have a Samsung S5 running Lollipop.