iPhone 6s Issues

I have had my iPhone 6s replaced twice for just shutting down, Bluetooth not working and wifi not connecting. Its a common issue if you google it. I just received my replacement today and they still give me the same warranty as the initial phone i bought. Its clearly a problem with the phone. See below link to exactly what i am referring to. https://www.cheatsheet.com/gear-style/7-problems-with-apples-iphone-6s-and-iphone-6s-plus.html/ Now I am at risk of having another issue with the replacement phone and its and issue with the phone. This is unacceptable.