Why does my screen turn on after locking? Or it turns itself on and restarts?

[AC Question]

I am using an ATT LG G4. I have had it for 6 days.

 

[B. Diddy]

Welcome to Android Central! Are you saying that the screen comes back on, and sometimes it reboots on its own? If it's this new, I'd just bring it back to the store and ask for a replacement while you can.