Some issues with new s4

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http://forum.xda-developers.com – Guys my gf using Samsung galaxy s4 from last 1 month and facing some problems 1st - sometimes capacitive back button gets pressed automatically while plying with apps/games(eg -while typing , keyword minimize suddenly and while plying game , game gets pause) 2nd Mobile heats a lot very quickly What u guys think about this problems?? Is these are hardware fault ?? Mobile is completely stock , no root nothin. Is there new official update/fix available for India ?? Screenshot is attached for software version detail Thanks in advance :o Attached Thumbnails (HowTos)