My phone settings keep changing, display keeps going on auto mode. What is going on?

A

AC Question

my phone settings keep changing. display keeps going on auto mode.

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.