Hi, this is my 1st android phone. I bought it a week back and now its very slow. Even the basic operations like swiping to unlock and texting is also a pain. It takes 2 or 3 secs to display a letter after typing. And also i think the sensors are not so effective or i even doubt if they are really working because when i try to hover an album in my gallery, it wont highlight the album. I even tried in settings where it asks you to 'try', also, when in lock screen, you know how you hover your finger over the screen and you can see a ripple following your finger.it doesnt work too.. out of all i'm really worried about the speed. Is it the same for every s4 or something is wrong with my phone ? Do i have to replace with a new one?? or Do i have to back up and restore once?? If yes tell me how to do it?