my phone is a samsung galaxy s4 I9505
after a little use e.g. browsing, scrolling through the phone, the top part of the phone gets pretty warm which is where the cpu is
the top part of the phone also gets quite warm when charging but the battery remains cold
in all instances the top part of the phone gets very warm
I have seen the display s4 s in a shop and they don't even get a little warm
is this a hardware problem, should I get a replacement