I had same problem
I decided to go to service center
Issue is with motherboard so the replace it
Now uts working fine
But there are 2 3 issue after service
1 phone heating
2 my left triger keep pressing it self
3 when i watching videos screen freeze for 10 to 15 sec
4 specker issu
5 and display is bit sheky after replacing that motherboard
So worst experience so far form asus service center