S7 not saving setting changes

[AC Question]

Okay guys I have recently gotten a s7 and I've been having a couple problems with my phone I would go into my setting and change inactive screen time out too 2 minutes and almost every time I exit out of the app or restart my phone it will go back to turn off instantly without interation this is very frustrating makes me love my old iPhone more also another problem is I'm going into notifications and turning the pop up of my SD encryption off and that won't go away either

 

[AlphaTango414]

Try wiping system cache via recovery mode.