Why is my Samsung turning off when I turn on WiFi?

[Android Central Question]

Hi everyone! I need heeeelp!
I have Samsung Galaxy Edge 6+. I bought it 2 years ago, it was working perfectly from the beginning... But! Now, when I turn on WiFi, after 2 seconds the phone turns off!
What should I do?
Thank you in advance!

 

[belodion]

Does this also happen in Safe Mode?

 

[B. Diddy]

Welcome to Android Central! Is it completely shutting down, or is the screen just going to sleep?