Why does my screen (galaxy s4 mini) keep locking?

[AC Question]

So I have my screen timeout at 10 minutes of inactivity but its keeps dimming at around 15 seconds and locking at around 25. I have no clue why I have looked through all the settings to try and fix this problem and it just started happening a few days ago.

 

[B. Diddy]

Welcome to Android Central! Are any power saving settings or modes turned on?