Switch off issue

I was talking to my friend on call and I started using instagram parlallely due to some discussion going on with my friend. But my phone got switched off automatically, 1st I thought I might have pressed the power button and restarted it. But the same thing keeps repeating. And after updating the new software update I have started facing touch issues while playing pubg, automatically some options keep selecting. Please respond Asap I'm feeling like I got the defective product.
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Hi @Shambhu694,
Can you please tell us the firmware your phone is on currently:
Firmware:
Go to setting => About => Software information.
I have attached a screenshot of it please try to solve it. I think their is a issue with the up speaker because there will be disturbance in sound while I'm on call or while seeing some videos.
I have updated the latest software available
@ARP_ASUS will you please respond?