the number of sales are actually what explain why so many phones are having problems...NO manufacturing process is perfect, EVERY PRODUCT will have defective units produced. Some get caught in the factories, others make it out into the wild. Thats why they come with 1 year warranties...you have 1 year to figure out if somethings wrong. Im sorry you're having issues...but thats just the luck of the draw. You have a defective unit. Go get it replaced
Take the number of phones with issues. Divide it by the number they sold...you'll see that their failure rate % is actually very (impressively) low
you forgot to add your apple support ******** response signature.