Apple India — iphone - 5s problem

Address: Visakhapatnam, Andhra Pradesh, 530024

This is second time im lodging a complaint against my apple 5s. As i told before my phone is getting switched couple of times without any reason. And 1 day ago i got my phone from apple service center after repair. Even its a new piece. Please exchange a new piece and please help me out with this defective piece. Im attaching a video as sometimes phone is getting restarted no of times or sometimes its being switched off for 2 to 3 days. This is really unfair and harrasment to any customer. Very much irritated with this phone.